Have been to German east island for weekend holiday, travelled from Stralsund to Rugen island. It wasn't really good weather during the trip, but it was still nice to see the ocean during the cold weather, windy, snowy, cloudy and gloomy. I enjoyed time with my dear friends, and also enjoy time in the peaceful atmosphere.
Compare to the summer season, I recommend you guys to visit Rugen island during winter and spring. It is peaceful and absolutely amazing. The only thing is you have to dress warm enough!