Angel Island, located in the middle of San Francisco Bay, is a great place to explore. From here you can get up-close views of the city of San Franciso, Alcatraz Island, Treasure Island, Mt. Tamalpais and Yerba Buena Island.
Looking at Angel Island State Park from the Golden Gate Bridge for example, you'll notice that it's the only island without any visable structures. There are miles of hiking trails to explore, and from the summit, 360-degree views await. The Golden Gate Bridge seems so close. To get there, you must take ferry boat from San Francisco, Tiberon or Vallejo,
Once on the island, I suggest first taking the easy hike to the top which is only 788 feet in elevation. You never know when fog might roll in, so you don't want to miss this view. The hike has some shady sections, but most of the trails are in the open, and exposed to wind. Along the trail, you likely will encounter just a few others on the uncrowded island. As far as wildlife, you probably will see mule deer. Angel Island is a great place to have a picnic, or just take in the fresh air and sights of the Bay Area. The island is known as the Ellis Island of the West as it was here that thousands of Asian immigrants were processed from 1910 to 1940. There are also abandoned military bunkers.
The ferry departs from Tiberon, CA 4 times daily, with the last departure at 11:20 am. For the return trip back to Tiberon, be sure to be at the dock several minutes before the last ferry departure.