you should try book alcatraz today. it will be sold out of you wait til you get there. i ahve heard the night tour is the best.
you can go across the golden gate bridge to a little town called sausalito is very nice. small posh sailing village. nice to walk around.(need to drive, get taxi or cycle to this place) renting a bike and even just cylcing accross the bridge is good fun.
in san fran its self, take a cable car ride from city centre down to the pier where alcatraz is, its very good. bring you camera too, the views are unreal.
also, at the other side of golden gate bridge, there is a steep hill up whats called golden gate national park i think, the view from up there is class, looking down over the whole san fran bay including the rock and the bridge. there are a lot of homeless people in the city, i ended up in a dodgt neighbourhood one evening on a walk, so u may just check with the hotel on that! san fran is not as hot as the rest of california... nearly always a fog rolls in off the bay, its a microclimate as such. dont forget if ur in macy's. take ur passport to the visitors reception and you get a card for additional 10% off everything. enjoy!!