(133 38) Saltsjöbaden - Kyrkogårdsvägen

After trying everything in Stockholm, this is clearly one of the best free parking lots around the city. Located less than 20 minutes from Stockholm, and by the sea, this quiet parking lot has free Wi-Fi near the building, a drinking water point at the cemetery, restrooms on the side of the building, and hiking trails in the forest. If you go deeper into the forest before the parking lot on the left, you'll find a fire pit with wood available. People come here for walks on weekends, but the parking lot is deserted at night. I'm traveling with a small van, but campervans should be able to park. Be careful, these are car spaces, but the parking lot is never full.