This is great fun and a wonderful way to add spice to history and architecture. The amphibious vehicles (once known as DUKWs) prowl the streets of Boston while a costumed driver gives details on everything from Paul Revere’s ride to the pub trivia of Cheers. The vehicle then slips into the Charles River where the tourists can get a gander of Cambridge on the other side and hear all about Harvard and MIT. Not for very young children but anyone from eight to eighty should have a ball.