Go to the southern-most point in Miami. Turn around and take the first left turn. Follow the road until it ends then turn left. There should be an opening in the fence. Turn right at the end and go past some dumpsters (the kind with ramps on them). Drive on the sidewalk until you see a large gray wall. There should be two blue pieces of wood set up like a ramp. Go up the ramp. You should land in a big curved halfpipe. Go forward up a hill with benches on it. There will be a skating-pool. To your right will be a regular halfpipe.