SSX is an incredibly fun snowboarding game that does a great job of recreating the fun, colourful, over the top feel of the classic SSX games on PS2. The tricks (and slopes) are more ludicrous than ever, and the game handles incredibly well. With 9 mountains, over 100 events, and online play, there is a ton to do as well.
If you want a realistic snowboarding game, get Stoked. If you want to do 10× backflips while doing a pommel horse on your board, get this. Great fun and was well worth the wait since the last SSX game.