Even on a tight schedule, Spree River Boat Tour earns the hours.
Allow 1–1.5 hr.
It's a genuinely restful, footsore-friendly way to see the central sights from the water, with cheap beer on deck and a running commentary. The catch: the commentary is often German-first or canned, departures clog with tour groups, and on a cold day the open deck loses its charm fast.