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.

Guardalavaca, a coastal paradise on Cuba's northern shore, promises an array of adventures for tourists of all stripes.  You can tranquilly explore the countryside on horseback, take a speedboat across the Bahia de Naranjo to the Dolphinarium, or spend a full day on the Beautiful Bariay Jeep Tour, which includes a trip to a local village where you'll visit a doctor's house, a school, and a ration shop. 

Myrtle Beach is a family-friendly beach destination—which means in addition to great beaches, there’s plenty to do when the kids are sick of making sand castles. Amusement parks, water sports and golf courses are nearby. And family-friendly dining and hotels abound.