Nipping at the ankles of the Andes, San Carlos, the largest ski area in South America, also offers thrilling boating, trekking, paragliding and climbing. The truly brave at heart can take the plunge into icy Lake Nahuel Huapi, which, even in summer, never rises above a chilling average temperature of 57°F. Beaches like Playa Bonita and Villa Tacul are stunning, but try to avoid the city in July, when the town is inundated by high-school students. more »