Fodor's Expert Review Upper Sûre Lake

The reservoir was dammed in 1961 to create a long-term source of drinking water for Luxembourg. Chunks of it are still off-limits because of this, but there's plenty to explore. In summer, solar-powered boats (May–October) take you on two-hour tours of the water. Mercifully, no motorboats are allowed here, but on warm days the lake fills with windsurfers, paddlers, and wild swimmers. You can rent canoes, kayaks, and SUPs from the youth hostel in Lultzhausen in July and August, and for walkers, there are some 90 km (56 miles) of trails to explore (maps are at the visitor center). But if you'd rather relax, several beaches line the shores at Insenborn, Lultzhausen, and across the water at Liefrange, with a more secluded stretch found just past the Burfelt viewing platform. This is where locals come to escape for the day.