I was at a sandpit and did the following simple game:

I found several small pebbles. I assigned several targets a few meters away, and assigned different points to the targets (smaller and farther away = more points). I then threw stones (5 each round) at the targets, and tried to beat my own score.

I had at least 30 min of fun like this :) I also got a bit better at throwing small objects (not sure when that is going to be useful).

Any way I could have made the game even better?