Other ideas: Parking garage races up/down (skateboards) get kicked out, megaphone Pool noodle jousting Slip-n-slide Gunnison river crossing/ford low water below dam? Track race on middle school gravel running track, 4x4 relay batons, whistle/megaphone closed course race Sun sets in the west, so riding east on roads is safer than west for car visibility. NSE for golden hour.