I'm always drawn to icy/snowy levels, with overwhelming amounts of cool blues, light indigos & whites that make just about whatever character you are playing as pop. I've always liked snow, so I guess it still applies in the video game world. Also the changes in the background music that come with snowy areas I like quite a bit. Plus the easily overcome obstacle of ice is added in, nice touch in my opinion.
One of my all-time favourite levels is the 2nd Hawkins level in MDK2. Classic gamelay, and really witty lines to boot. (Diffusing those bombs were fun as well). As for atmosphere, either jungle, rocky or snowy terrains, as I like the aesthetics.
I'm more of a temple person, since I like stuff like myths and legends about them (yes, I know it's a game, but I like that kind of depth to them). I also like arid/desert levels, since I was born in Arizona (and that's basically a desert) :/
Ice and Snow are great(there even better if there is caves and stuff but that is beside the point)
Urban Areas the best shooter environment I can think of(unless you are doing something with sniping then it is no fun but whatever)
This may sound like a cop-out, but it really depends on the level design for me.
I mean, I really liked the ice dungeon in LoZ:TP because it was done really well, and it looked like it could be a functional house in its own right, rather than just a themed dungeon with a strange layout.
As opposed to Kingdom Hearts, where I really enjoyed the first game's castle level and a similar one plus the space-themed level in the second game.
In general, though, I kinda like Space and Urban levels as far as backdrops.
i guess my favorite is the dungeons and temples. I guess thats probably because i was practically raise on dungeon based games and plus dungeons can have a lot of variety. the only areas i don't like are deserts and icy areas. i hate deserts because i think they're boring, sand, sand, more sand, ocasional oasis... and i hate the icy areas because they usually just mess you up with slipping, etc. or they're puzzles like pokemon's icy areas...