@czechglobalhosts, That's very deserve swimming spot tips given for struggling from heavy temperature indeed Prague. Passengers can be cool and protect from warm using as you mentioned spots here. Cheapest entrance fee best enough satisfaction to them.
Most inserting to mine Zlute Lazne coz there are large recreation and swimming around Vltava River. It's big opportunity to leave from heavy condition.
Another interesting to mine Vodni Nadrz Dzban. It's placed in inside nature reserve. I saw from web images there. It's most tourists attraction place.