Fire Fighting

Fire Fighting or Play putting out fires.

Draw a fire with chalk.
Put it out with the hose. (Or any water)
The chalk drawing should disappear, but you may have to rub it lightly while the hose is on it.

This is an absolute favorite at our place, any time its hot enough to play with water.

Jumping while doing it is also fun.

Some extensions are all kinds of water play, as well as playing pretend fire fighters, (slide down the pole, drive with sirens etc.)