This tour is like nothing I have ever seen or heard of (especially not in Scotland). The vehicles are from WWII and allow you to drive through the city seeing the major sights and then also 'drive' into the river and see Boston from the water.
The tour guides are all fantastic and really make the experience. All people on the trip have to quack; however, the most amazing thing is that the locals, including a police car we passed, quack back!
If you are staying in Boston for a few days, I would higly recommend this trip as it lets you get around the city, learn about the history, and get a wacky feel of Boston within a couple of hours.