Yes you can swimm directy in front of the hotel. The hotel has a beautiful garden area for hotel guests only. Ideal with such temperatures.
Yes they do. I have and it's a great experience.
Actually it's not great to swim right in front of the hotel as you are too close to the ferries and it's stony. But five minutes to the left is a park that's great for sunbathing and swimming. 5 minutes to the right is a "beachclub" with deckchairs, showers and snack bar.
Get an answer from Romantik Seehotel Sonne staff and past guests.