Tropical Islands located 60KM south of Berlin was excellent. My kids enjoyed being in such a large complex and we could sleep inside a tent. We paid 200EUR for our tent and that gave us access to the water-park for the two days. (If we hit this place up just for the day… that would have been close to 100 euros alone) Each person has a wristband that allows you to purchase food and drinks. Included in the cost was an “all you can eat” breakfast. We were swimming till midnight on our first day there.