What's the best park in or near Arlington for small children?

If I lived in Arlington, I'd probably head a little south of the main part of the hamlet and go to Greenvale Park. There are swing sets, see saws, and lots of other things for them to play on while there, and it's a pretty nice place. There is a second, huge part of this park down by the Wappinger Creek where there are lots of soccer fields, for when your kids get a little older and want some more room to run around. When I went to school near here, we'd have field days and picnics at this park so it's definitely suitable for little kids.