Here's one for the locals... Alternatives to Gölisnäs?

So here is a question for true locals...

For years I have frequented the Gölisnäs recreation area in the Inkoo archipelago, especially appreciating its primitive, secluded, uncrowded atmosphere and especially the inexpensive general sauna opportunities.

For reference: https://uuvi.fi/en/area/golisnas/

Unfortunately, Gölisnäs will not be operational this summer, as it undergoes reorganization and rennovation, and so I am interested in learning about similar locations, if any, in Southern Finland. There may be nothing equivalent, as it is quite the special gem, but I thought I might as well ask, and hope there exists something comparable.

Of particular interest are locations which have public, open sauna options with swimming, either free or for a reasonable fee, as opposed to renting a private sauna.

Access by car and tent camping are essential.

Anything within ~5 hours drive from the capital area would be of interest, though of course, closer is better.

I generally dislike commercial campgrounds and caravan parks, much preferring national parks and forest recreation areas. I would not be interested in any places which are congested/crowded, without some degree of privacy and a natural, primitive atmosphere; but I am not, in principle, opposed to paying for a campsite or ammenitites if the "feel" of the place is right.

So if anyone knows of any such options, I'd be very happy to hear about them. Thanks!