No timed entry, parking permit or entry reservation is needed. The park says only camping requires a reservation, and its pages list no entrance fee.
Vehicle length limits (large vehicles & trailers): There's no turnaround for large vehicles after the Faraway Ranch parking area, about 1 mile past the entrance. Vehicles over 29 feet must park at Faraway, and trailers must be unhitched there (trailers with a campground reservation can go…
Bonita Canyon Campground: The park's campground requires a reservation, made through Recreation.gov. Vehicles longer than 29 feet (counting bike racks and storage) can scrape the dip in the entrance road, and many sites are small, so read each site's description…
Backcountry camping: Backcountry camping is prohibited, and there are no public through trails to the Coronado National Forest, so no backcountry permits are issued.