Not too bad out here. The normal obstacles of course, but the only truly odd thing I've seen was a person riding an engine assisted bicycle (with the engine running). Even though it says no motor driven bicycles, I could care less if they are pedalling, but this guy was flying down the place reving the engine at at least 25 mph, doing wheelies every now and then. Lucky for me I wasn't using the MUP, I was in the dog park next to it with my lab.