If you ever get a chance to visit the Holge Veluwe national park here in the netherlands do so. It's amazing. A world class art meuseum with an enormous sculpure garden, nestled in the middle of a giant natural park complete with sand dunes (surrounded by forrest!) hundreds of kilometers of bicycle paths and 5000 free white bicycles to go around on. Just don't show up when it is raining (fortunately the rain stopped after 15 minutes, but being huddled in the rain at the entrance was not great fun).