Boston Hop-on Hop-off Trolley Tour with Optional Harbor Cruise. Explore the best that Boston has to offer on this hop-on hop-off tour of the city. Visit 20 of Boston’s top attractions — like the USS Constitution, the Boston Tea Party Ships and Museum and Fenway Park, to name a few — on a 1.75-hour loop. Select a 1-day pass, then board at any of the 20 stops and get to know the city in custom fashion, with live on-board commentary from a professional tour conductor. Includes a 45-minute Boston harbor cruise. Book and Save 43%: Boston Hop-on Hop-off Trolley Tour with Optional Harbor Cruise.