Dh's sister would like to take my 9yo and 8yo ds's to either San Diego or San Francisco this summer. They are having trouble deciding; of course one wants to go to SF (because he wants to go to Alcatraz) and the other wants to do SD (wants to go to legoland). They will be meeting up with dh's other sister, who lives in LA. (The three of them visited her in LA last summer). Any insight on which would be better for tween boys?