A few years ago, I recall playing some arcade game where you mountain biked. Pedaled, and everything. Even had to balance the bike some.
I know the game was at COSI Columbus a few years ago, because that's where I played it, but it looks like they don't even have the arcade any more, so I wouldn't be able to find out there.
Google is USELESS - it's giving me crappy flash games. Dammit, I don't want the game where you have to not run over the teddy bears!