The Isle of Lewis and the Western Isles in general, excels in this area.
Almost every village has its play area and they are all of a high standard.
One of the best play parks is in the north at Eorpie, Ness, and this park is certainly worth a visit! The range of climbing, crawling and swinging is almost endless and all amongst the dunes.
A trip up north to see the lighthouse and to combine it with both wet and dry weather activities for the kids makes the journey very worth while. There are now toilets at the playpark and a 'pop up' café during the school holidays. Facebook link