The Top 10 Adults-Only Vacation Spots. Jade Mountain Resort in St. Lucia. 1 of Auberge du Soleil in Napa County. Cambridge Beaches Resort & Spa in Bermuda. Secrets Marquis in Los Cabos. Fairmont Royal Pavilion in Barbados. Excellence Playa Mujeres in Cancun. Sandals Royal Plantation in Jamaica. Travaasa Austin in. Oct 21, - The Best All-Inclusive Packages at Adults-Only Resorts of parenthood (or a romantic getaway that isn't stifled by shrieking infants or toddlers.