In pedestrian-friendly Boston, many see the sights on foot. But if you have a limited amount of time, a trolley tour may be the answer. This company offers a 100-minute narrated tour of Boston that passes many of the highlights of the Freedom Trail as well as the Back Bay. You may get on and off the trolley as much as you like. Trolleys depart from in front of the New England Aquarium on the waterfront. The trolley also makes pickups at many downtown hotels.