Hi bubba - went over last august & like young foster left it too late to book tickets to Alcatraz - due to American tourist holiday month - should be easier in september though.
things to do (depends if your staying down town or near fishermans wharf).
Fishermans wharf is the place to be, nice restaurants, open air crab market ( they just knock up a crab for $20 in a small basket and a couple of spoons) sea lions, Pier 39 variety of shops, etc. All the boats big and small go from various quays along the promenade to Alcatraz and Golden Gate bridge.
Get cable car at Powell street (get a 3 day ticket - really cheap - get up early one day, say 7ish and ride all 3 lines - no one else on them apart from locals going to work)
China Town is a must, together with City Hall, tour of Pacific Bell park home of the Giants is good, guided tour of Grace Cathedral is interesting,trip to Castro and Haight Ashbury is a good day out by old fashioned trams from all over the world. theres the crooked roadway at Lombard street.
Down town Union Square has all the major department stores and has a terrific atmosphere.
The best tours I took was in an old vintage car tour that lasted 90 minutes or so (did all the sights seated 8-10 people - open sided with a fantastic guide who knew his stuff) I think it was called Mr Toads vintage car tour - leaves from waterfront fishermans wharf - well worth it.
Also I would recommend a sea plane tour which lasts about 15-20 minutes flys over the 2 bridges and Alcatraz, Downtown , Muir woods, etc. Can book tour via hotel - they taxi you to where the sea plane takes off and drops you back again after the flight - all very professional.
There are also helicopter trips over the bridges and Alcatraz.
Have a wonderful time!