In San Francisco, don't miss the Exploratorium. It's a great experience for anyone who pays attention to the world around them. A walking tour of the San Franc

In San Francisco, don't miss the Exploratorium. It's a great experience for anyone who pays attention to the world around them. A walking tour of the San Francisco waterfront is a good way to get a feeling for the city. There's an App for that -- http://itunes.apple.com/us/app/san-fran-waterfront/id407567581?mt=8 http://itunes.apple.com/us/app/san-fran-waterfront/id4075675... -- buy it for your iPhone and you'll be set.