I certainly took full advantage of all the available sporting activities in RAFG during the mid to late 1950's. I have sum very pleasant memories of sailing on the Steinhuder Meer which was the biggest lake in Germany but I believe only about five feet deep. The RAF had a sailing school there with a selection of boats for hire at a nominal price.
In winter we had access to skiing at Winterberg where all the gear could be hired, all again for a relatively nominal fee.
I also took advantage of the gliding facilities at Gutersloh and Wildenrath.