Jul 1, - The 11 Best Adults-Only All-Inclusives on the Beach. The Caves, Jamaica. - Sandals LaSource Grenada. - Excellence Playa Mujeres, Cancun. - Jade Mountain Resort, St. Lucia. - Sanctuary Cap Cana by Alsol, Dominican Republic. - Zoetry Paraiso de la Bonita, Puerto Morelos. - Secrets Wild Orchid Montego Bay, Jamaica. -. This boutique resort is perfect for a relaxing getaway with full service spa, large stretch of white sand beach, freeform swimming pool and an adults-only.