3) Is there good access to the RP canyon? I would guess so I usually start from the trailhead
The ‘proper’ accesses are located at the east and west end of Calle Cristobal. The west end is located at the south side of Calle Cristobal at the bottom of the hill (large parking lot with a gate). The east end is supposedly at the park located at the north end of Camino Ruiz (intersection Camino Ruiz and Calle Cristobal). I have not checked the access from the park yet. It is possible to mountain bike from the west access, heading to the east – all the way to 15 and past by a bit.