The Madrone Group Camp can be reserved for up to 50 people. Four cozy cabins at Madrone may each be reserved for up to five people. There are three sites at Devil’s Gulch. Two tent-only sites can each accommodate up to 10 people. The larger, equestrian-use-only campsite has a corral, hitching racks, and water troughs; it can accommodate up to 20 people.
Information website: https://www.parks.ca.gov/?page_id=469
Map Link (beta): https://www.google.com/maps?q=38.0242948,-122.7213977
Bookings: https://www.nps.gov/pore/learn/upload/sitebulletin_campgroundsinmarin.pdf