I’m pretty sure I rode by this place on my bike about 3 weeks ago. It’s just kind on the side of the road out near 国防乐园. Can’t remember the exact road. Anyhow it is the “American Extreme Sports Park” or something like that according to the signs. It didn’t look open at the time. According to the paintings on the wall around it they offer other extreme sports like rollerblading and doing wheelies on road bikes. If I get a chance I’ll ride back out that way in the next week and then post the exact road it was on.