There is a wonderful five mile trail which rings the Angel island. Bicycles can be rented on the island, or can brought by ferry. The climb to the top of Mount Livermore is worth the sweat and effort, for the views are breathtaking. There is day use camping on Angel Island and even overnight camping is permitted on certain occasions. The park is open every day of the week, in the spring, summer and autumn.
Winter hours vary, and it can get very windy at times so be prepared.
Ferry service is available from San Francisco, Tiburon, Oakland and Vallejo. The Tiburon ferry is probably the best, since you return from Angel Island to another wonderful location. Call the ferry companies for details, prices and schedules.