Take a ship - if you make it without sea sick
How about a boat trip on the Baltic Sea from Timmendorfer Strand to Groemitz or the Fehrman island? We haven't done that as I really am not "sea safe" (those few times I needed to take a ferry my stomac did nothing but turn and turn and turn more) yet the offers for any boat trips do look interesting and not too expensive.

Snack booth w/wonderful & small meals
On the safe side, a spectator only (w/Rose' shirt)
Baltic Sea
Villa Boehl