Cruise up the Havel from Werder to Potsdam on a relaxed 2.5-hour boat trip. You will glide across the Great Schwielowsee, drift through the Caputher Gemünde, and spot Caputh Castle, the Brandenburg State Parliament, and the Nikolaikirche along the way. Grab a drink, pick the breezy sundeck or the air-conditioned lounge, and let the river do the rest.