Thrasher: Skate and Destroy was the best skateboarding game before Skate hit the scene.
It's still worth every moment you get a chance to play it these days.
The complexity it has like PLG pointed out is pretty crazy till you get it on lock.

Also, throw away Mat Hoffman's Pro BMX while you have the chance.
It is an absolute piece of garbage. Grab Mat Hoffman's Pro BMX 2 for a much better version of that series.
Dave Mirra Freestyle BMX 1, Remix, and 2 I'd recommend buying as well because they are the best BMX games to date.