Nothing's better than relaxing by the water while you're on vacation. Take a picnic to Tollensefluss and then hang around for a lovely sunset.
You'll have sightseeing choices galore when in Neubrandenburg. Tollensefluss is a great place to kick off here, but there are numerous other interesting sights to discover. The Concert Church, Reitbahnsee, and Augustabad are near the body of water and will round out your day nicely.