While in Boston for a few days, my family and I took a few hours to ride the CityView Hop-On, Hop-Off Trolley. They stopped at many interesting tourist sites, including the Commons, Port, and others. Both of our guides were knowledgeable and had a great sense of humor, which made the ride pleasurable. I would recommend this tour to anyone, and you can ride all day and spend time at all the stops, or pick a few like we did and be done in a few hours. Trolleys are always by every 10-15 minutes, so if you just miss one, that's ok.