Kaatach

Jetties, a diving tower and a separate children's beach on one of the cleanest swimming lakes around, with minigolf by the kiosk and a kids' nature trail.

754 hectares of forest around a chain of lakes, with swimming, canoeing, fishing and berry picking, and the Sörmlandsleden trail running through.

An outdoor center on Källtorpssjön with swimming, a café, and kayaks, canoes, SUPs and cross-country skis to rent.

The largest old-growth forest south of the Dalälven, with gnarled pines and small lakes between ice-smoothed rock, and sheep and cows at an 18th-century village.

Thousands of square meters of slides, nets and trampolines, with a pirate ship, a volcano climb, tricycles on their own track and a Mini World for under-fives.

Free visitor center built as a map of Sweden, walking you through the national parks from south to north, with a five-station trail out back.