If you ever go to Berlin to ride (you should) you could do a lot worse than stay at Tentstation. The campsite is about 5 minutes walk from the main train station and is nestled in one of Berlin's many leafy parks. The campsite is laid back with a bar and the usual campsite things such as BBQ's and shady communal showers but this gem has an empty swimming pool that you can ride. The pool isn't transitioned but has nice flat banks with a wallride/sub at the top. The good folks at Tentstation will even drain it for you if it has been raining! Those friendly Germans.