A small forest lake. There are a lot of vacationers in the summer. There are not many places convenient for diving into the lake. One beach with sand. And the rest of the places are floating.
There are lifeguards on the beach and various entertainers come on weekends in the summer.
The lake is not deep, but it is deep in the riverbed.
There are grass snakes where there is grass. If they crawl quietly on weekdays.