Very beautiful lake worth staying (overnight if you have a tent or camper) for photo opportunities and/or take away lunch (if you're just passing by). Toilet is not well maintained and quite dirty though, so is the lounge and washing area. Good time to visit here would be on weekdays (as there will be little to no other visitors) so you could maximize your time and fully enjoy the place.
If you like out of the way, a picnic without the crowds. Fishing.