This year, book three full-paying guests and bring a fourth person free on select departures! 

Book by June 30, 2022. Bookings of three full-paying guests may bring a fourth person for free on select departures. Offer applicable only on bookings of two double-occupancy cabins, and second cabin must be in same category or lower as first cabin. Valid for new bookings only, subject to availability, not applicable on airfare or extensions, and is not combinable with other offers. Call for details.