I'm attending a conference in Moscone during the week of August 28 - Sept 6th and I'm taking my family with me (hubby and kids aged 7 and 10). I'm planning to buy them the city pass with the Alcatraz option, and I've pretty much given them a list of things that they can do while I'm in conference for the week. That leaves us with 4 weekend days to do things together. I was wondering if it was worth it to use one of those weekend days to head out to Six Flags or Great America - we are staying at the Palace Hotel and will not have a car, so I'll have to find travel arrangements to get there. If it is worth it, and if so, which one would you recommend?