I would have a bat and ball-softball or such, a couple of balls to play with about the size of a volley ball, if you don't have a net you can put up string on some trees if available. Maybe some badmitton or such games as well. Walmart has a bunch of this type of stuff for a couple of bucks. You will be surprised how well the kids will group together and play. The older ones will probably get a game of tag or something.