Pay attention to the signs after you leave the parking lot and head down into the arroyo. We missed the turn for Arroyo Loop and ended up on Wagon Road. Good thing we weren't in an actual wagon! This trail is steep, not that wide, and has a washout down the middle with sizable rocks as obstacles. This trail is best ridden downhill (very doable) unless you'd rather take the bike/hike shortcut to the top.