To be honest, the best information about the different state parks and beaches can be found at this website...
http://www.explorer1.com/halfmoonbay/parks-recreation.htmWe have had so much fun just taking off south on Highway 1 and stopping often at all the beaches and parks. There are a ton of beautiful photo opportunities along the way.
Bean Hollow (the first one heading south) is amazing with its Tafoni, tidepools and agate be...