Enjoy a 70 minute sightseeing tour on the Charles River.  Passes are valid only for regularly scheduled Charles River Tours departing from the CambridgeSide Mall in Cambridge.  For the 2017 season, the cruises sail daily from May 13 - October 9 at 10 am, 11:30 am, 1:00 pm, 2:30 pm or 4:00 pm. Reservations are not accepted with these tickets and passes must be exchanged for a boarding pass at the ticket booth prior to boarding.  Valid only for the Charles River Tours.  No expiration.