Bay seniors with an interest in bohemiana will want to check out the very rare visit to Druid Heights, a beat era hangout, party pad and spiritual center secluded beyond Muir Woods. It was the site for sleepovers that included Ginsberg, Kerouac, Judy Collins, Alan Watts, Dizzy Gillespie and Margo St.James. Alan Watts wrote his first book on Zen Buddhism here. The hike is an easy 3 miles and though it takes place on August 20 from 10 to 2, better hurry, the deadline for reservations is July 22. Find out more about its exotic history here. It’s free but only if you’re a member of the invaluable Golden Gate National Parks Conservancy ($35 a year).