Plan your summer or fall vacation early. Get a special rate of 15% off when you make your reservations NOW for any stay from May through October 2021. Offer expires February 28, 2021. Use promo code EARLY2021 when making your reservation. Offer only good by booking directly on this website. REMINDER: This year Acadia National Park is requiring a Park Reservation 6 months in advance to visit Cadillac Mountain, Sand Beach, and Thunder Hole. Also remember to get your car Park Pass as well for the dates you will be visiting.