One of San Francisco Bay's most prominent landmarks, Angel Island played a considerable role in the history of California and is now one of the region's favorite spots for hikers, bicyclists, tourists, and anyone who just wants to get away from the busy life on the mainland. It's a great place for a family day trip, with plenty of opportunities to picnic, hike, learn, and just take in the surrounding natural beauty.
We took the kids (2 and 5) on the ferry to Angel Island last week, and they had a great time. My son was so excited to take the ferry ride over there. Everyone had a great time riding on the top of the boat and looking around at the water and all the passing boats. The ferry ride over there is very quick and painless. We stopped at the cafe for some ice cream cones, which were very good and worth the purchase. I recommend bringing a picnic, a blanket, and some sand toys. There's a neat little beach for the kids to play in the sand and kick around in the water.