Don't personally like these levels as much. They look quite nice, but the mission choice really lets them down (aka nothing interesting happens as far as gameplay is concerned).
Especially the Beach Bowl Galaxy. There are some very dull missions there I'm afraid. Wasted potential.
There's also this "buyable" level in world 4 of Super Mario 3D Land. The snow is wonderful!
Buyable level?
You mean the boss levels near the end?
Though...I haven't played 3D Land in awhile due to Mario Kart 7...
No he means another unlockable level. Not sure which though, Mario Wiki says no snow levels in any world 4.