Strap on your skates and tear up the ice at the Boston Common Frog Pond. If you're not so good on your feet, sign up for skating lessons; if you know what you're doing with those skates, show off on the ice. Also, the pond features College Night on Tuesdays. Get a little cold on the ice? Stop at the Frog Pond Cafe for a cup of coffee to keep you warm.
While you're hanging out in the Boston Public Garden, take a ride on the city's signature Swan Boats. The boats are the only ones of their kind in the world and they float the waters of the Public Garden lagoon. A ride on one of these boats is the best way to see all of the attractions in and around America's first botanical garden.