The Boatsetter software is limited to 1/2 or full day options. However, I also do a 2 hour harbor cruise (for $325) or can arrange a special trip if you let me know what you're hoping to do. Also, Boatsetter charges you a 10% booking fee which is added to my pricing.
Osterville - Edgartown Harbor Cruise provides harbor cruises of Osterville and Edgartown harbors, as well as private charters, aboard GHOST, a 2008 Hunt Surfhunter 29 powerboat. We offer a variety of customized boat cruises (around the bays of Osterville & Cotuit and to Edgartown), and are happy to work with you to plan the perfect boat charter to suit your specific tastes.