Located on the Riviera Maya, south of Cancun, the 412-room Secrets Maroma Beach Riviera Cancun is a romantic, adults-only all-inclusive resort, set on a private white-sand beach lined with sunbeds, cabanas, and palapas. In addition to the buffet, a wide range of high-quality dining options are available, including Japanese teppanyaki, French cuisine, a wine cellar with over 200 different vintages, and, for an extra charge, romantic dinners for two on the beach. A stunning destination-style spa offers couples' treatments in private outdoor cabanas on the beach. Rooms are large and tasteful, with four-poster canopy beds, separate sitting areas, and private balconies; ground floor rooms are swim-up suites. The hotel is especially popular for honeymoons and destination weddings, though numerous additional fees can make a stay here pricey.

Senses Riviera Maya by Artisan is a chic all-inclusive boutique with a sexy side. Kids aren't allowed and there's a nude area and whirlpools on the rooftop deck -- plus the grounds are decorated with au naturel statues. The boutique sports 38 massive rooms with luxe bathrooms, private terrace plunge pools, and spectacular ocean views. The oceanfront infinity pool is a favorite with guests, while the restaurant serves up drinks and food with mixed reviews. Beach access, a shuttle to Playa del Carmen, and free yoga are big pluses. However, the upscale hotel has cut back on in-room amenities, disconnected room kitchenettes, and weakened the minibar selection. For a luxe boutique villa option just down the beach, it's worth comparing rates with the five-pearl Kin Sol Soleil. 

Kin Sol Soleil is a luxury beachfront boutique embedded deep in the rain forest of Playa Maroma. Most guests consider it a hidden gem and a secret worth keeping, while others simply call it home. The nine large villas can come with private pools, furnished rooftops, or full kitchens. They're stocked with bottles of local wine, craft and local beer, snacks, and overflowing bathroom amenity baskets. The hotel's gourmet restaurant, Pavo Real by the Sea, serves up a delicious and generous free breakfast, plus lunch and dinner at an extra cost. There's also a small circular pool, though most guests lounge on the idyllic beach. For a secluded feeling with a more modern vibe and all-inclusive rates, Senses Riviera Maya by Artisan is a decent alternative -- but it's adult-only.