Awesome kid fort idea: king size duvet cover plus exhaust fan facing into duvet cover=awesome fort. Or use a king size bottom sheet over a queen size bed and face fan inwards. Great hot summer night idea for kiddos.
Glow sticks in the pool, great for night swimming! Not sure this would be the best idea for a big in ground pool (would probably take a couple hundred sticks), but would definitely be cool in a kid pool or an above ground pool!