Marshmallow Catapult: I thought this would be a fun and great idea for students to make in class. The project of the marshmallow catapult incorporates both art and science.when you can't buy them all a marshmallow gun!
For pool lanterns, stick a glow stick in a balloon and blow it up!
If I had a pool I would totally try this out. Put a glow stick in a balloon for pool lanterns. Pool party on a Summer night! I think this could work pinned up on the fence of a backyard without a pool, too, so really great idea for any outdoor BBQ/party!
Diced Darts -- Take turns rolling two oversize foam dice toward a dartboard-like target of rings. Score points by multiplying the number showing on each die by the number of the ring it lands in. Could also add and subtract numbers for a different game.