I guess I don't underdstand the concern when it comes to Cliff Drive. There have been cars, cyclists, joggers, and dog walkers on Cliff Drive and Reservoir Dr for years, and there are holes that play along those roads, and yet we've somehow managed to make disc golf work up to this point. People park along 12 and 13 to party and drink and I cannot recall anyone being hit with a disc, at least not anything resulting in serious injury or damage. It's not as if the MTBers are going to be coming through there every 5 seconds. Maybe common sense isn't common, but I think it's common enough to allow disc golf and MTBing to coexist at Cliff Drive.