D.M.
It's not a sprayground, just a big old fashioned sprinkler that's lots of fun...Phelps park in Teaneck, off River Road, right opposite the FDU campus. There's a nice shady playground there too. It looks like street parking isn't allowed, but there's a metered parking lot - you need quarters. I think it's $.25 for 30 minutes up to 2 hours - something like that. Have fun!