The swimming area is protected in a bay in the eastern part of the lake and has a nice sandy beach. Some benches are available and even an outhouse. Parking next to the beach.
It is also possible to canoe from Svenarums canoe rentals in Svenarum to the swimming area in Rolstorpasjön. It is a day trip and take a few hours. Fits both a group of friends and family. You can then be picked up at the beach and driven back to the starting point.