What fun outdoor activity's can i do in a fenced-in yard?

I have a fenced in yard and a large driveway that I draw on with chalk all the time, but in the summer the driveway gets too hot to kneel on and I don't really have any other outdoor toys and we have no trees for climbing, no bushes to hide in, and it slopes downward and then just drops because of a hole, so we can't play soccer and I have no one to play tennis, badminton, or baseball with. I don't know what to do:(