Fodor's Expert Review Volcán Alcedo

A more ambitious trek, requiring adequate planning and equipment, is 1,100-meter (3,600-foot) Volcán Alcedo. The site can be reached only by boat, after which a 10-km (6-mile) trail climbs over rough terrain. You cannot traipse around the island without a guide, and you'll need one here. Your rewards are stunning views and a chance to see the archipelago's largest population of Galápagos tortoises.