Boston Harbor Cruises: Your adventure begins as soon as you step aboard our Provincetown Ferry, Salacia, the largest and fastest catamaran of its kind in North America. She’s fully equipped with clean, modern amenities including a snack bar serving beer, wine and cocktails. Sit back with a cold margarita and plan your P-Town activities, read a book, or watch the Boston skyline and Harbor Islands as they slip below the horizon.