Bluebeard gave his new wife all the keys to his castle telling her "they open the doors to the rooms which contain my treasures. Use the keys, enjoy yourself." He also gave her the key to one room beneath the castle, telling her, "you must never enter this room." He then went away and left her alone.
DIY hoola hoop fort. Could be a reading tent, or a secret hideaway, or a sleeping nook
Menus give you something to look forward to.
I like the shutter/window combo...