Cutting a Watermelon . what a great idea, and so simple.mom always cut wedges for us and made us go sit on the curb to eat watermelon(so we wouldn't get sticky stuff all over the house and walkway!) this also would be good for parties, or cook outs!
This is called a Swedish flame. Make your cuts like you're cutting cake, leave about 6 inches at the base, throw about a cap full of fuel oil in it. It burns up to two to three hours Can use olive oil instead of fuel oil :-) Any oil will burn!
Instead of water balloons make sponge bombs! This is a great way to beat the heat without using up a lot of water, and sponge bombs can be used and re-used all Summer long. (And don't have all those balloon pieces everywhere!