Enhanced Lights and FX
Indoors, windows will leave focused rays of sunlight where they would naturally fall rather than lighting up the whole room and caves can be set to a realistic darkness so you have to get those normally useless torches out! Outside, the weather, the sun, the days and the nights are all intensified to make Skyrim a much more interesting and beautiful place! Get it here.
Expanded Towns and Cities
Adds a bunch of new buildings, decoration and NPCs to the world of Skyrim. It makes the place much more exciting after you have played through the game 14 times and know the residents better than your grandma. My favourite addition is the new market outside of Whiterun! Get it here.
Verdant - A Skyrim Grass Plugin
The picture up top shows you the beauty of this mod in my game. It completely changes the way the world looks by adding new grass types and upping the density. It is advertised as a performance friendly grass mod and I can vouch for that as I have a mid tier PC with about 70 mods installed in my Skyrim game and I've never had any reduced frame rate. Get it here.
Realistic Water Two
I've tried a few different water mods but this one is my favourite. I can't actually put my finger on why (which is totally unhelpful, I know) but I think it just looks the most realistic and fits in with the whole "Beautiful Skyrim" look I was after. The texture, the animation and the audio are really well done. Get it here.
Stones of Barenziah Quest Markers
Because who can be bothered to look for them all? Ain't nobody got time for that. Get it here.
A Quality World Map and Solstheim Map - With Roads
I would still get lost around some parts of Skyrim if it wasn't for this baby. Maybe I'm just useless but I can't tell you the amount of times I would end up at the top of a mountain instead of the town I was aiming for. But now I can just check which road I need on my new, fantastically well made map and give myself directions - sorted. Get it here.
Climates Of Tamriel - Weather - Lighting - Audio
I honestly can't big this up enough. I wouldn't know where to start. It is by far my favourite mod as it just has everything in it and it's all done so well! The weather ranges from the most glorious orange sunrise to the most terrifying midnight thunder storm. The lighting settings can all be adjusted to completely change the atmosphere of Skyrim but also fit in with how you like to play your game. The audio though... It absolutely is magnificent! The change in my feeling of the game after I had heard the immersive ambient noises of animal speaking, the wind rumbling passed me and the cracks of thunder as the fork lightning crashed down. Seriously, just get this mod here!