Try a spot of indoor camping. Who says tents have to be pitched outside? If you have a pop-up or small dome tent then this is quick and easy. If not a few blankets and tablecloths can create the most wonderful indoor den.
Drape blankets between sofas and chairs, over stepladders and clothes-dryers, or tie the ends to cupboard knobs and door handles. Once the den is created find some special snacks, colouring pages and pencils, a CD player and music, a torch or two, and camp out for a while!