Glad you had fun! Lot's of thing's to do in San Francisco, the seals sound fasinating.
I love that City I was born and raised there for awhile. I have relatives in the Oakland area, I try to make a trip to SF every other year in mid-July catching the Bart from Walnut Creek to Mission St. walking over to Market than jumping on the Cable Car to Fisherman's Wharf. My Father lived on Hyde st. for many years. When we were kids we would jump the cable cars all the time for fun.
If your not in SF for long just a day Cable Car Tour is fun short little fun trip! Then do Alcatraz Tour at night. Alcatraz is a complete different tour at night from the day the tour's at night they try to make a little scary.....
Everyone should go to SF at least once :)

http://gocalifornia.about.com/cs/san...blecartour.htm