we were stranded by hop on hop off.we took a water taxi to te uss constitution,we bisited the museum and other sites. The tickets said a pickup spot was the constitution museum. we waited 1/2 hr no bus so I called their office and told the guy we were in front of the museum and we were at the corner of 1st and 5th.he couldn't tell me where th pick up spot was except it was a bus stop near some Hotel.when I questioned him further he hung up on me. I tried calling him back he wouldn't answer and it went to voice mail. I left my number and told him we were waiting and needed him to please call me back. He never returned my call.we waited another 1/2 hr. we finally hailed a taxi and returned to our ship.we were stranded and ripped off. Don't do business with hop on hop off,poor customer serve .