Once each week ds (3.5) goes to play with next-door neighbour girl (also 3.5) or vice versa. We both have a tiny plot of back garden, just enough to kick a football in or to play simple hunt-for-things games, both of which we do quite regularly. Now that the weather is getting nicer, the kids are spending even more play time in said gardens. Next-door neighbour mum is incredibly organised/creative about thinking up games (I'm useless, I'm afraid) but even she is running out of ideas. What else can a couple of 3-yr-olds do outside in a small plot of green?