Here are my mine in no particular order:
1. Sunken Ghost Ship (SMW)
-Reminiscent of SMB3 airships, but underwater and better.
2. Lethal Lava Land (SM64)
-I love riding the Koopa shell.
3. World 3-2 (SML)
-I like the waterfall effects.
4. Honeyclimb Galaxy (SMG)
-I love how simple it is.
5. Noki Bay (SMS)
-Just beautiful.
6. Giant World Level 6 (SMB3)
-You can alternate between normal and giant.
7. World 8, Bowser's Castle (SMB:LL)
-Difficult.
8. Tall, Tall Mountain (SM64)
-Fun slide, monkeys etc.
9. World 4-2 (SMB2)
-Jump on Whales!
10. Dusty Dune Galaxy (SMG)
-Cool tornados, thwomps and pokeys.
What are your favourites?
CowLaunch