Yeah we'll let the Yankees in, but we're gonna keep an eye on y'alls...

BTW Emma Long Park (aka City Park) has 6.5 miles of mountain bike/motorcycle trails as well as 2.5 miles of hiking trails, too. It's really a gem in the city. But they do say that Austin is a city within a park...

Here's some info links:
PDF of Park Facilities
A map from City of Austin (not real good, I've seen better)
Bike trail review
More trail info