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.

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 Aventuras mingles tropical beauty with the riches of the sea. Beaches are fantastic, with powdery, white sand, and there's excellent fishing as well. For a fun day, explore the eco-archaeological park Xcaret, or snorkel at Xel-ha, a natural inlet water park. The Mayan ruins at Tulum, only 25 minutes away, are another must-see.

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.

It’s not just for spring-breakers. Cancun, with its golden beaches and perfect climate, is the premiere coastal destination in Mexico. And while there is certainly a 365-day party available for college students, resorts cater well to families and to those seeking solitude. This Yucatan paradise is also the gateway to the ruins of Tulum and Chichén Itzá.

Just north of Cancun, this seaside resort community is a far cry from the spring-break crowd. Bordered on one side by the Mexican Caribbean and the other by a wetlands wildlife preserve, the vibe in Playa Mujeres is one of laid-back luxury in a natural, untouched landscape. Unlike many other such tranquil places, Playa Mujeres is not a pain to get to. It's an easy ride from Cancun airport.

If you’re looking for a budget-friendly island holiday, consider the Bay Islands. Each one appeals to different travellers—Roatan’s the most developed (but still not as built-up as, say, St. Thomas), Guanaia’s rustic and Utila’s in between. All three have great dive spots and beaches.

Abandoned in the 10th century, the stunning Mayan ruins at Copan deserve as much time as you can spend there, a full day or more. Travelers recommend that you hire a guide; you'll learn so much more about this World Heritage site and its history and people than you ever could on your own. After your adventure, sip a cup of strong Honduras coffee and people-watch in the main square or just enjoy the beautiful mountain scenery.

Cat Island is simply ameowzing. Really, all puns aside. Legend has it that magical creatures inhabit the underground caverns of Mermaid Hole, and the ruins of Deveaux Mansion and Armbrister Plantation are breathtaking. A hike up to the Hermitage stone monastery on Mount Alvernia, the highest point in the Bahamas, will reward you with panoramic views. A guided tour of the island’s diverse creek systems is a must for nature lovers.

Steel and coal may have built this city, and you'll see the names "Mellon" and "Carnegie" on an awful lot of things, but Pittsburgh has come a long way from its gritty, industrial past. The Waterfront Complex, a collection of shops, restaurants, a cinema and even a water park, was recently built on the site of the former Bethlehem Steel Works, and two new professional sports stadiums have opened downtown in just the past two years. However, history buffs will delight in a visit to sites like the Point State Park (home of the Fort Pitt Museum) and the Duquesne Incline, where you can ride an antique cable car and browse displays about this unique form of transport. If you don't mind the extra drive, a trip to Frank Lloyd Wright's Fallingwater makes a rewarding detour.

Lima, founded by Francisco Pizarro in 1535, is a fascinating city and a treasure trove of history. Explore ancient Incan archaeological sites, or stroll through the elegant cathedrals and opulent palaces dating from Spanish colonial times. Downtown Lima is crowded, but you'll enjoy exploring the city's neighbourhoods—especially the beachfront areas, which have great shopping and dining and fabulous hotels.

Day-trip distance from Buenos Aires, the Tigre River Delta offers porteños (Buenos Aires residents) and tourists alike a playground for everything from horseback riding and hiking to fishing and swimming. Comprised of hundreds of tiny islands, the Tigre is about 20 miles northeast of Buenos Aires and is reachable from the city by trains, then by boat from the train station. While the main attraction here is the delta itself (formed where five rivers come together), you’ll also find a Naval Museum, restaurants and playgrounds for kids. Several tour companies offer day-trip excursions to the Tigre River Delta—but visitors also can book stays in area bed & breakfasts and adventure lodges.