The Monterey Aquarium is amazing (I lived in Monterey for the first 5 years of my life).
As for San Francisco...it's just kind of a nice city to visit, there's not a lot of must see stuff there. Fisherman's Wharf is nice, but be prepared to pay too much if you go to a restaurant there (I think I paid $25 for really bad spaghetti last time I was there).
The Golden Gate Bridge is cool, just remember that it's a one-way toll. I've never been to Alcatraz, but I know there are ungodly lines. There's also a major chocolatier headquarters in the same area (Ghiradelli?), which is supposed to be cool too.
As for San Francisco...it's just kind of a nice city to visit, there's not a lot of must see stuff there. Fisherman's Wharf is nice, but be prepared to pay too much if you go to a restaurant there (I think I paid $25 for really bad spaghetti last time I was there).
The Golden Gate Bridge is cool, just remember that it's a one-way toll. I've never been to Alcatraz, but I know there are ungodly lines. There's also a major chocolatier headquarters in the same area (Ghiradelli?), which is supposed to be cool too.