Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Lübeck (57% of total searches to Baltic Sea (Schleswig-Holstein)). The next most popular destinations are Flensburg (24%) and Luetjenburg (14%). Searches for hotels in Kiel (5%) are also popular.
KAYAK users have found double rooms in Baltic Sea (Schleswig-Holstein) for as cheap as $44 (Lübeck) in the last 3 days. The average price is $280.