The air and sun bath near the Volkspark Unter den Eichen has a play, sports and nudist area as well as a Kneipp pool and was inaugurated on 03.07.1921. From 1922-55, the Unter den Eichen air and sun baths were managed by the Wiesbaden Kneipp Association, and since then by the city, which renewed the infrastructure by connecting it to the sewage system and expanding the sanitary facilities. In the 1960s, additional sports fields and a large children's playground were added.

Today, the Unter den Eichen air and sun baths, with its separate naturist areas for men and women, has a lawn area of 34,000^m2, various play facilities and extensive relaxation zones.