For distance, scenery, and the great outdoors, there’s no better ride on the planet: Argentina’s national highway parallels the Andes for 3,100 miles, from the bottom of Bolivia to Tierra del Fuego, the tip of the continent. Rent a bike in the colonial town of Salta, 235 miles below the Bolivian border. Then point it south for as long as you like. The road passes through red sandstone deserts, the wine regions of Mendoza, and the Patagonian adventure hub of Bariloche, where you can kayak 1,400-foot-deep Lake Nahuel Huapí. Beyond that are the granite peaks of Los Glaciares National Park and, eventually, Ushuaia, the southernmost city on earth.