Lidl

There are several parking lots where you can spend the night. During the day, you pay via the EasyPark app. Maximum 4 hours, but you can pay again after 15 minutes. 3 euros per 4 hours. At night, you pay 10 euros. Make sure to bring change. All 3 spots are within walking distance of the lake. You will find clean public toilets at the swimming pool. I was here alone and felt completely safe.

It was a regular Lidl parking lot, right in the middle of town, where there's still something going on even in the evenings. On the way to this parking lot, there were a few parking spaces in wooded areas right by the lake, which I'd recommend.

Tarred parking lot that is relatively quiet overnight. Free from 8 p.m. to 8 a.m., otherwise the first hour is free and the additional hour costs one euro.