Forwarding anonymous report from #Mapy.cz user, please verify: It should be possible to drive right to the campsite Topaz by car.

https://www.openstreetmap.org/directions?engine=graphhopper_car&route=54.79978%2C17.85114%3B54.79999%2C17.85089#map=19/54.79981/17.85107&layers=D