For families we especially recommend a visit to the "Wiehlpark" in Wiehl (Sorry, German only!). Situated right next to the station, there are playgrounds, barbecue areas and other family-friendly leisure activities in this open park area. A covered barbecue area, including sets of beer tents, tableware and dishwasher can be hired here (Sorry, German only!).
On a hot summer’s day your children will be could be enjoying a swim in a public pool - either in Bielstein (Sorry, German only!), or in Wiehl (Sorry, German only!) - or visiting the stalactite cave in Wiehl (Sorry, German only!).
The website of the "Naturarena Bergisches Land" deals with the subject "Families" in a seperate section (German website with poor online translator).