The pristine shores of the Western beaches of Tomales Bay await you. Primitive sites are unmarked, first come first serve, and accessible only by boating in. If you plan it right, you may catch a bioluminescence show in the water once the sun sets (plan for new moon times). I recommend, launching your boat from the Miler Boat Launch in Marshall (eastern side of the bay). Overnight parking is $5. First campsites are a 30 minute paddle across the bay. The best (less crowded) can be reached by heading north 45- 75 minutes out. Campsites are by reservation only and require checkin at Pt. Reyes Station.
Things to note: Outside of the two largest beaches, there are no amenities (toilets). You must haul everything in and out on your boat (that includes your waste).