You can't go wrong getting lunch at this famous market, which dates back to the 1800s. Peter recommends a roast pork sandwich from DiNic's and an apple dumpling from Beiler's Bakery. (Leave room for all the food at the wedding, though!)

If the weather's nice, you can walk, run, or bike along this beautiful riverside path. (You can go if the weather's bad, too, but we don't recommend it.)

Visit one of the most significant locations in American history: the site for some key scenes in the movie National Treasure. (Also, the Declaration of Independence and the Constitution were signed here.)