Plan to take this boat tour. The views from the bay are outstanding. The tour boat is open so you are at an advantage to take in all the sites. It was a clear day so we could see across the bay into the towns that line the opposite shore.
The boat is large, so you are with about 100 people so you really don't feel the waves under you. The tour is narrated by a salty sea captain which is nice because it tells you the history and current events of San Francisco and the surrounding waters. You float under the Golden Gate Bridge for a feeling like no other. That bridge is massive, and you feel it looking up.
The day we were there, the sailboats were abundant. So that was great for the photos. The boat also travels around the island of Alcatraz. That is the famous old prision. I'll tell you that I think that anyone could have swam that bay if they were strong enough and had a good reason, say escaping from prison. The old buildings are a sight to behold, and what a strange feeling you get—almost spooky.
You then float to see the Bay Bridge that links San Francisco with Oakland and finally the cityscape. The hour long trip was well worth the costs (about $20). A must for any traveller.