Our cruise ship stops for the day in Warnemunde in June. We are not doing the Berlin excursion. I'm thinking of renting a car for the day and exploring Schwerin and Bad Doberan perhaps. Seems like it would be cheaper for a group of 5 to rent a car for the day instead of joining cruise organized excursions or using the local public transportation. We are in port from 7am until 9:30pm so we have lots of time to explore the area. Any thoughts on driving to Schwerin and Bad Doberan and where we might rent a car?