This indoor water park near Bern has three long water slides, a “wild water canyon,” lazy river, and a splash pad for small children. 

For adults, it has a wellness area with several relaxing heated pools with massage jets, both indoors and outdoors. They also sauna rooms, steam baths, hot/cold plunge pools, high salt pool for floating, 

Location: Riedbachstrasse 98, 3027 Bern

From Bern: 8 mins by car, 15 mins by train.
From Interlaken: 50 min by car, 1h20 by train.

Website: https://www.bernaqua.ch/