Level 4 Locations

Shiny Things Labs

Shiny Things consists of a prohibitive number of smallish rooms, all of which surround a large open area. You're going to have to make this large area even larger by knocking down most of the walls in the building to create a single, huge kitchen/entertainment complex. You should be familiar with the equipment you need by now, so proceed with the destruction, making sure to clear the walls of any excess lamps or decoration. A wall with something on it will resist the awesome might of the Build tool, so clean before clearing. You can keep the bedroom where it is, if you like, but moving it closer to the bus stop might be a wise idea.

As far as curb-side skill-building goes, the best option is the Tesla Coil, after you unlock it. If you notice a little lightning bolt shooting off, you can enter the Buy mode and sell it for 50 bucks a pop.

Note also that Vaughn and Makino are true neat freaks, which somewhat obviates the need for a Maid, if you oppose the continued employment of the service class. Concentrate on your primary character's motives, and let your roommates do the cleaning and cooking.

Goals

Invite Your Lover Over : Bird of Paradise
Either fall in love with one of your roommates (scientists are pretty sexy, after all), or call over one of your other "special friends" to automatically complete this goal. Get Married : SpritzenFunken Q3 (vehicle)
Buy $1500 Worth of Equipment For the Lab : KraftKing Inventor's Workshop
Show Off Rocket Gnomes At A "Launch Party" : Hypnotize Social option
You'll need to have the Inventor's Workshop for this party, so unlock it and use it to boost your mechanical skill until you start making red Rocket Gnomes. After you've made five of them, place them outside the Lab with the Buy menu, making sure that they're in a line. Throw a party, and when your guests arrive, launch all of the gnomes off, starting with one on either end and moving down the line. None of your guests actually have to be outside to witness the big event. This will complete your objective and get you the Hypnotize option.
Go To Studio 8 And Change Their Minds About Scientists : Pathmatic Sliding Door
If you manage to jump through hoops and complete the Launch Party goal, travel over to Studio 8 and use the Hypnotize interaction on either of the proprietors to unlock a new sliding door.
Find Out Where The Contaminating Spores Are Coming From : Giant Fern
As with the previous mission that saw you stealing a fern from Dudley's Trailer, this objective requires you to hop over to the Goth Manor and pluck one of the ferns from their lawn. Easily enough done.
Get to Vivisectionist in Mad Scientist Career : Tesla Coil 3.0
Get to Gene Splicer in Mad Scientist Career : SLP Lamp
Get to Covert Ops in Paramilitary Career : Horrowitz "Star-Track" Telescope
Get to Secret Agent in Paramilitary Career : WarKraft Radar Dish

Club Rubb

Again, there's plenty of open room which you can mangle as you see fit. Begin by selling off any low-quality seating items that are in the main room, then proceed to set up your kitchen in-between where the bus arrives and the door. You may want to expand onto the lawn outside this new kitchen area to make a bedroom and bathroom, or two different bathrooms for your party-goers. If you do decide to make new bathrooms, sell the toilets on the far side of the club to avoid having people wander around.

As you buy and place your entertainment equipment, keep in mind that you're going to need to buy the Bounce My Booty Dance Floor to fulfill one of the goals here; it's a 4x4 dance floor that offers up unparalleled Fun, but obviously requires a lot of space. You may want to knock down the wall leading into the former bathroom area and/or eliminate the bathrooms and sinks back there, in order to back your DJ Booth up and save space for the BMBDF. At any rate, it becomes available after buying just 1,500 dollars worth of items, so pick out a couch or two, exit Buy mode to unlock it, then put it down wherever you have space in your main room. It does offer up 10 Fun, so you may be tempted to replace your Hellagraphix with it, but remember that your Sims also regenerate their comfort when playing the Hellagraphix, assuming they're sitting on a couch. Sims get no comfort from dancing, but still, it's a nice change of pace, and the new interactions that you can unlock here go well with it.

Goals

Invite Your Lover Over : KlassicKlean "More-Saic" Tub
Calling over a lover or falling in love with one of your roommates fulfills this goal. Get Married : SpritzenFunken Q3 (vehicle)
Buy $1500 Worth of Equipment For the Club : Bounce My Booty Dance Floor
Find Out What's Going On at Toane's Gym : Wicked Breeze Outdoor Shower, Visit Studio 8
All you have to do here is visit Toane's Gym and do three Triple Jumps in a row off of their high-dive board. This is easy enough to do, if you've built up your Body score. Otherwise, you may have trouble stringing together the dives. If you can't seem to perform correctly, skip this goal and come back later.
Throw the Ultimate DJ Dance Party : Q3 Recliner
To begin with, throw a party and invite a few extra guests over. To complete this goal, you're going to need the Bounce My Booty Dance Floor, so buy a few extra accoutrements for the club, exit out to unlock it, then place it near your DJ Booth. After your guests have their basic motives appeased, have one of your Sims with a high creativity skill get behind the DJ booth and select the "Spin" option. Your other two Sims will have to use the dance floor and dance, while inviting the partygoers over. As soon as you get five people on the dance floor, you win!
Show Off Some Club Rubb Moves at Studio 8 : The Apoplectic Photoelectric
To complete this goal, get friendly with Bing Bling until you learn his Breakdance Social interaction, then visit Studio 8 and perform for either Artie or Charity. Get to MVP in Jock Career : Tell Dirty Joke Social option
Get to Super Star in Jock Career : Wolf Whistle Social option
Get to Game Show Host in Movie Star Career : Booty Tease Social option
Get to Sitcom Star in Movie Star Career : Moon Walk Social option
Get to Hair Stylist in Fashion Victim Career : Admire Body Social option
Get to Makeup Artist in Fashion Victim Career : Slow Dance Social option

Casa Caliente

As with Toane's Gym, you're going to have a lot of free space with which to play here. Your first objective should be to move the kitchen near the door, and move the other Fun equipment back where the cooking equipment originally was. Note that the Counter-Culture career is going to start taxing your cooking skill here, so you may want to replace your regular stove with one of the large Epicurious Gourmet stoves, available under the Skills section of your Buy menu. Regular food can be prepared on this stove, or you can use it to make hors d'oeuvres and boost your cooking skill. (Normal cooking, of food from the refrigerator, won't boost your skill, so get ready to make a lot of snacks.)

The entertainment area can be placed fairly close to your dining table; just set up whatever your usual assortment of Fun-boosters are, and replace the recliners with Von Brauns or Deiters to suit your taste. If the fireplace takes up too much space, move it into the now-empty former kitchen; it'll boost the room score wherever it is, so just get it out of the way and let it do its thing from a distance. The smaller room on the other side of the fireplace wall can become your house's main bathroom, with a Force Flush and a Sonic Shower; another bathroom can be built on the deck near the entrance to the house to give your guests two options.

Lastly, you'll need to situate your bed. The small room at the rear of the house is barely big enough to hold a bed or two for you and your roommates, but you can go ahead and construct something a little nicer by moving the pool. Don't shove the pool all the way back to the beach, though; knock down some of the iron grates outside and move it laterally away from the building so that it's still accessible to your guests, or just sell it back if you don't want to fragment your parties. After that's done, use the Build menu to make a spacious new bedroom for yourself. Don't forget to add lighting to your interior rooms, especially if you blocked off their windows.

Note the telescope out near the beach; you can move this towards the sidewalk so that your Sim has something to do while waiting for their bus.

Goals

Invite Your Lover Over : Hawaiian Fantasy Tiki Torch
If you've developed a lover before now, you can call him or her and get intimate (via Kissing or Flirting) to complete this goal. Falling in love with Randy or Paisley also works.
Get Married : SpritzenFunken Q3 (vehicle)
Buy $1500 Worth of Equipment For the Club : Sham-Shag Polar Bear Rug
Score with Two Sims at the Same Party : Romantic Kiss Social option
As the name implies, you're going to need to start a party (via the telephone) before you can attempt to, ahem, "score." You'll need to have good relationships with your targets, and their moods will need to be high, so start the party off with food and accessible bathrooms, and when your targets start to mill about, call them into an enclosed area, like your bedroom, and use the Try and Score interaction on them. Make sure you do this individually, though; either lover will get upset if they see you mackin' on their competition.
Go to Studio 8 and Help with the "Outsider Art" : That 70's Window, Visit Goth Manor
All you need to do here is to visit Studio 8 and paint a picture on the easel. If you sold it when you were there earlier, buy a new one and put it by the curb to shorten your walking distance. If you don't have a high enough creativity score, you may have to come back and try again later.
Find a Neighbor Who Knows About Candelabras : Torchemada Candelabra
Bella or Mortimer can both be used to complete this goal. All you need to do is get friendly with either of them and use the Romantic Kiss Social option on them; if you haven't unlocked it, you'll need to do the party goal above and try again. You'll unlock the Torchemada Candelabra, which has a rare (for lighting) room score of two. Still, if you aren't having trouble getting your room scores high, you don't need to bother with this.
Get to Body Guard in Gangster Career : Force to Slap Self Social option
Get to Arsonist in Gangster Career : Niagara Love Tub
Get to Yoga Instructor in Counter-Culture Career : Vibromatic Heart Bed
Get to Transcendenalist in Counter-Culture Career : Sili-Camp Tent