Spa-goers have flocked to Carlsbad since its mineral spring was discovered in the late 19th century. Today, you can visit the site of the original well, but you can do much more than just "taking the waters"—Carlsbad’s spas offer world-class services.

In Ensenada, only 80 miles south of San Diego, travellers can get a taste of Mexican food, culture and nightlife. Californians flock to this beautiful sea port, one of the largest on the Baja peninsula, for rest, relaxation and excellent outdoor recreation activities. From surfing and sea kayaking to horseriding and mountain biking, even the most discerning sportsperson will be impressed. Ensenada's nightlife is also a big draw. Papas and Beer and Hussong's Cantina serve up an on-going party atmosphere and lots of tequila, while nearby vineyards offer wine-tasting in a more traditional and serene setting. Nature enthusiasts are thrilled by the sight of grey whales and the underwater cave that randomly squirts water at onlookers. Whatever your interests, enchanting Ensenada will not disappoint.

Beyond its epic theme parks and perfect weather, Orange County is celebrated for outdoor dining, entertainment and beach-bound adventure. Treat yourself at South Coast Plaza for the finest in luxury shopping and superlative restaurants. Spend an afternoon aboard a whale watching cruise in Newport Harbour, or cast a reel from the Huntington Beach Pier. Stop to smell the flowers at the Sherman Library and Gardens, or explore Laguna’s vast variety of boutique shops along the Pacific Coast Highway.

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."

With nine bays and 36 beaches, Huatulco is ideal for anyone who loves the sun. It's not an overdeveloped resort town, but the hotels are comfortable—even luxurious. Ecotourism is gaining in popularity, so take a break from sunbathing and try river rafting or a hike through the jungle.

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.

Isla Mujeres offers a wide variety of tempting options for beach lovers, and is a relative bargain. Snorkel with tropical fish amid coral reefs, skim the blue waters by kayak or boat, or windsurf along the shores of soft, sandy beaches. On land, you can sunbathe, dine on seafood, dance to Latin rhythms, tour on a moped or belly up to the bar for fresh, delicious drinks.

A city trapped in time, Havana captures the imagination like no other. Faded glamour meets careful colonial-era reconstruction with a backdrop of irresistible colour. Walk El Malecón, the walkway bordering the ocean; visit Old Havana and the Catedral de San Cristóbal; and listen for salsa music, open-air bazaars and parties that last all night.

Cuba's top beach destination sits on a 13-mile-long peninsula with powder soft sands lapped by waters of the Kawama Channel. Resort hotels teem along the shore that U.S. celebrities and gangsters, including Capone, discovered in the 1920s. Clubs and bars provide mojitos and merriment, after long days baking on the beach, golfing, diving or deep sea fishing. Rent a scooter or hop aboard an open-air tourist train or bus to see more of this stunning spot. Caves, keys and virgin forest add to the area's allure.

Cayo Coco, an island just north of mainland Cuba, has some of the world’s most gorgeous beaches—think superfine white sand and shallow, clear water. It’s popular with European travelers seeking a sunny escape at one of the island’s beach-side resorts. Snorkeling and diving are fantastic.

U.S. citizens still need to jump through a few hoops to visit Cuba, but as visitors from around the world know, this island offers some amazing opportunities for cultural exchange. Havana is a mix of old-world architecture and of-the-moment culture. Head out of the capital city to the small town of Trinidad to see more Spanish colonial architecture. It’s a UNESCO World Heritage Site and a fantastic home base for a visit to the Valley of the Sugar Mills, a pocket of land that formerly served as the centre of Cuba’s sugar industry.

Get the experience of visiting two island colonies in the same 37 square miles. Saint Maarten/Saint Martin's spicy marriage of Caribbean, French and Dutch cultures matches its physical diversity: the island is both urban and untamed, with rain forest-like landscapes, white beaches, and amazing caves and wildlife.