OK, I'll be honest, whenever I go to San Francisco, I promise myself I'll avoid the Fisherman's Wharf / Pier 39 area. Too many overpriced tourist shops, not enough affordable food, too many people crammed into one place. But, for some reason, I usually end up breaking this promise. So far, I've come up with 4 reasons for this repeated weakness.
Reason number one - the sea lions. You've got to admit, these guys, noisy and stinky as they can be, are pretty cute. They sit on the docks next to Pier 39, barking and sunning themselves, pretty successfully ignoring the crowds of people watching from the edge of the pier. Remember, though, if you visit during the peak summer times of June and July, you may not get as good of a show. The sea lions tend to migrate to the Channel Islands during the summer months. While you're there, be sure to check out the Marine Mammal Interpretive Center and store as well as the National Parks store. Both are located on the upper level of Pier 39, right across from the sea lions.
Reason number two - the view. If you go to the end of the Pier 41 (where the boats leave for Alcatraz), you get some pretty nice views of the Golden Gate Bridge, Alcatraz, and, turning around, of the city.
Reason number three - people watching. I really shouldn't admit this one, but it's true. The best spot is right in front of the Alcatraz ticket office, where the street performers gather. Watching some of the reactions is usually more entertaining than the performers themselves.
Reason number four - Alcatraz. This really shouldn't even count. All you do is leave from Fisherman's Wharf. Check out my separate Alcatraz entry for info on the attraction that all travellers to San Francisco should see at least once.
There you have it - the reasons I usually get sucked into Fisherman's Wharf and Pier 39. Avoid it if you can. I hope you're more successful than I usually am.