We signed up for a 3 to 3-1/2 hour tour of the central city, and our guide, Josh, gave us even more time than that--every bit of it fascinating. We saw things that only a bike could find, as well as the famous sites, all backed up by great stories from Josh. Why is only one facade of the art museum finished? I know now! With easy riding, refreshments at the Italian Market, and safety assured by Sky, our charming rear guard, this was an experience of Philadelphia that couldn't have been better. For anyone who remembers how to ride a bike, this is a don't-miss-it.