You can take time to visit Priwall Peninsula during your travels to Lübeck. Take in the museums while you're in the area.
You can find out about the history of Gluecksburg with a visit to Gluecksburg Castle. While you're in the area, stroll along the waterfront.
Explore the waterfront in Weissenhaeuser Strand with a trip to Weissenhauser Strand Pier. Wander the parks and seaside while you're in the area.