There is a hut at this spot where you can spend the night. With fireplace and door. And outside place to light a fire.
A little further on there is a toilet house and a beautiful deck for swimming and fishing.
Lots of mosquitoes so don't forget your mosquito spray! (we had forgotten, teenager not amused). Once you get to the parking lot with the signs for Ritamäki, you've gone too far. Walk back up about 100 meters along the lake. Then you will see a small path on the left through the forest towards the lake. Turn that in and you will see the hut.
---- Here you find a little cabin with fireplace inside and a door. When you are at the parking with the sign for Ritamäki, you went to far. Walk back up the road along the lake. After approx 100 mtr there is a small path on your left. It goes through the forest downward towards the lake. There it is.