San Pedro is "La Isla Bonita" that Madonna made famous. Now it's a tourist mecca, but still boasts great beaches and plenty of dive shops so you can enjoy the sun, sand, and sea. Plan a side trip to Caye Caulker while you're here; it is less developed and more laid back, and has its own splendid swimming areas.

Located near the Mexico-Belize border, a true paradise awaits travelers in Bacalar. The town sits on the Lagoon of Seven Colors, a lake nicknamed for its beautifully colored water, which makes it the perfect place for stunning sunsets, fresh seafood, and cenote swimming.

It’s true: parts of Belize are getting touristy. But San Ignacio remains rustic, making it a great base for budget-friendly tropical adventure travel. Canoe on the Macal River, or walk to Mayan ruins at Cahal Pec (just be warned: it's uphill).

Once a sleepy fishing village, Placencia has emerged as an increasingly popular eco-destination on the Caribbean. For those who enjoy outdoor adventure, the Stann Creek region offers a host of activities: hiking through mountainous rain forests, kayaking, deep sea fishing, diving and exploring Mayan ruins. The peninsula boasts 16 miles of tranquil beaches, with a lagoon to the west and the Caribbean to the east and lots of peace and quiet in the middle. Tour guides and dive centers offer a variety of excursions, with boat rides to the outer cayes an ongoing favorite. Also popular are guided land tours to Mayan Ruins or trekking the jungle trails of Cockscomb Basin Wildlife Sanctuary, where the first Jaguar Reserve in the world was established.

Whether you’re a high roller or a low-key lounger, Las Vegas has something to suit your vacation taste. Sample fare from top chefs and cornucopian buffets, try your luck at one of the world’s premier casinos, or take in a spectacular show. Just wandering the Strip is enough to get your heart pumping. Once you’ve had enough of the razzle-dazzle, wave hello to the toothy sea life at the Mandalay Bay Shark Reef, hike Red Rock Canyon, or visit the Neon Museum, where old signs take on new life.

Argentina's top beach resort town, Mar del Plata boasts 10 miles of sandy beaches, from family-oriented La Perla in the north to very popular Bristol in the center and sophisticated Faro in the south. Regardless of the beach, expect very dense crowds, particularly in the summer months. Once an elite enclave, it now attracts visitors of all budgets.