Lego car with balloon power
Magic Potions and Fizzing Formulas - one of the best kids' science experiments EVER! Added bonus - you can use the same combo to get them to clean the bathtub!
20 Creative Bottle Cap Ideas (Recycle Crafts) - Craftionary
3 different types of volcano activities for kids!
Lego racing track- melamine sheet with electrical tape. Great party idea! Let kids make cars and race 'em.
Angry birds and boxes outdoors
Bottlecap Candles | 20 Rad Things You Can Make With Bottle Caps