Cool the kids off with a homemade sprinkler. Take a 2 liter soda bottle, poke holes in it. Attach to a garden hose via a male to male adapter that cost less than $5 at Lowes. Toss over a tree branch and let hang. You can adjust how the water sprinkles by adjusting the water flow. When the bottle gets worn out, just switch it out with another bottle, no additional cost!
No more mosquitos!! Cut the top off a 2 liter bottle. Invert the cone and place it inside the straight part of the bottle. Glue the two pieces together. Add 1 tsp yeast and 1/2 cup sugar to some luke warm water, and pour the mixture into the bottle. Mosquitoes are attracted to the carbon dioxide that you exhale. The yeast feeds off the sugar and emits the same gas, so the mosquito enters the bottle, thinking she will find food there. Gotta try this!
I saw this tip in "Country" magazine years ago and use it every year to trap yellow jackets and hornets. I have this one hanging in the grapevine. The yellow jackets like the apple juice better than the grapes. Lures them right in and they can't get out.