Many Riders return to Boston on Monday by ferry.
Bay State Cruise Company runs a two-hour Provincetown Express high-speed ferry which departs Provincetown at 10:30am, 3:00pm and 7:30pm daily. The boat docks at the World Trade Center in Boston. From there you can take a Water Taxi to Logan Airport. You can book tickets online or call 617-748-1428 for additional information.
Boston Harbor Cruises has a high speed ferry service which departs Provincetown at 11:00am, 4:00pm (and 8:30pm on weekends) and takes only 90 minutes. Tickets can be purchased online, by calling 617-227-4321 or at The Whale Watch Store 309 Commercial Street in Provincetown. The BHC ferry arrives at Long Wharf in downtown Boston right next to the Aquarium stop.