Mine was walking to the shop barefoot and pretending I was going to fetch supplies for my family in the scorching heat in the desert. The old chewing gum used to melt and turn squishy is it was hot enough and I used to squish it with my toes.
Another was going to the river and jumping from one side to the other.
There was a broken tree which all the neighbour kids used to 'live' on and we would go to 'eachothers houses' on the different branches.
basically living in the shallow river.