It's been a while since the last real Mario adventure, and Mario Sunshine is overall bringing all that back.
You start off and you are on an airplane, and at the moment, you are heading to Isle Delfino, and you are watching a movie for that. Now you're ready to land, and all of a sudden, ah! The plane takes a sudden brake and when you get outside, you find something is wrong. Princess Peach notices a mysterious thing shaped exactly like Mario, but nobody else does.
After the mess, some authorities come clutch Mario away, and Mario ends up in court. Someone starts explaining the problem, but Mario has no idea what he is talking about. We don't do spoilers, so.
How will you clean up the mess that you are ordered to clean? Well with the help of Fludd of course. He is a new thing that is simply a water nozzle. What it can do is pump water out of it to destroy enemies and usually activate certain stuff. He also has a hover nozzle which will let Mario hover in the air, but it is limited to just a few seconds. There are also two more nozzles. There is the rocket nozzle and the turbo nozzle. The Rocket Nozzle allows you to basically blast off from the ground pretty high, which helps a lot during certain levels. There is also the turbo nozzle which lets you run faster, but it isn't real necessary to complete the game.
Yoshi is also making a return in this game. There is a level and if you beat it, then you can get the Yoshi Egg in Delfino Plaza. Yoshi doesn't do much more than Fludd. All Yoshi really does is squirt juice and eat enemies, although this Yoshi is vulnerable to water, so watch out for that.
The gameplay is pretty good. The graphics are good enough and the sound is pretty good. But during the game, you'll probably feel like the game is missing something that's tough to explain. The graphics are pretty good for Mario, but the camera gets in the way of the whole gameplay, especially on one of the levels near the Ferris Wheel. It would have been great if you could just lock the camrea, but Nintendo didn't really think about that.
The game also gets annoying because the level objectives are usually repeated over and over again and it just makes you mad. At first, they are fun, but soon they start to look old and you just don't care anymore.
This game is an excellent choice for people who love Mario games, but if you've never played it, try something else for a while.