Medernach, Ermsdorf, Stegen and Eppeldorf offer various playgrounds.
There are also dedicated picnic areas at the "Schmuelewald" in Medernach (from Medernach follow Haller , the area is in the woods on the road towards Savelborn) and on the Belvedere along hiking track E8 starting from Stegen.
Further, both campsites own very nice playgrounds, also allowed for non campers. At Camping Neumühle in Ermsdorf there is a nice playground and at Camping Kengert you can find an indoor playground as well as a maze of local bushes.
To plan your trip well in advance, you can have a look at the different picnic, barbecue and playground areas in the Mullerthal Region – Luxembourg's Little Switzerland:
tourisme.geoportail.lu
Legend: P: Picnic area G: BBQ area S: Playground
Please note that you'll need a permit from the municipality to use some of the BBQ places.
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