Stretching from the fishing village of Puerto Morelos to the biosphere reserve of Sian Ka'an, the Mayan Riviera offers an unforgettable Caribbean coastline experience. Divers and snorkelers will be dazzled by the wrecks of Xcaret and the Puerto Morelos reef. Use a zip line to descend into the sacred subterranean caverns of LabnaHa Eco Park, where you can snorkel an underground river under a canopy of stalactites. The nearby Tulum Monkey Sanctuary will put you in a playful mood.

Most visitors to Playa Paraiso stay at one of the five huge Iberostar-branded resorts in town. Judging from the TripAdvisor reviews, everyone from honeymooners to families with kids can have a blast at the properties’ beaches and pools. Two excellent golf courses are also located in town.

One of the top diving destinations in the world for its bright storybook coral reefs, the island of Cozumel is also home to a variety of natural beaches. Choose a beach with soft white sand for relaxing, or snorkel off a rockier vista. A destination for both adventure and romance, Cozumel has a year-round Caribbean climate, untrammeled jungle and abundant nightlife.

Puerto Morelos, a peaceful village on the Mayan Riviera, is a place to experience the genuine Yucatan. Puerto Morelos makes an excellent base if you’re looking for someplace quieter than glitzy hotspots like Cancun and Playa del Carmen. Government eco-reserve designations protect the reef and mangroves—and the village itself—from development. Outdoor options range from thrilling jungle and diving adventures to serene bike rides or moped explorations.

Akumal means "Place of the Turtle" in the Mayan language, and if you snorkel here, you just might see one swimming alongside you. (Don’t touch it, though. That’s prohibited by law.) You’ll definitely see coral and beautiful fish in the clear, sparkling waters. This tourist-friendly little town is about an hour south of Cancun—but it seems light-years away.

Tulum is relaxation and romance with an ancient angle. Guests can enjoy modern takes on traditional Mayan massage and spa treatments, or sunbathe on gorgeous Yucatan beaches within site of well-preserved ancient ruins. A rare mix of beach, archeology and village, Tulum is a romantic getaway like no other.

Is there any possible way Las Vegas could not be on our "best nightlife" list? The only way we could possibly omit it is on a technicality—since you can do pretty much anything 24/7 in Vegas, it might be wrong to call it "nightlife."