Kelley Park is a multi-use area right in downtown Ballston Spa. There is a picnic pavilion and a big playground, a grassy field for playing catch or throwing frisbees, and a quarter-mile nature trail that loops through the woods.
It has a canoe and kayak launch, and it's a short paddle to the next take-out at Gray's Crossing, or you can go all the way to Driscoll Road Landing.
There is good fishing access, and a path along the water for several hundred yards. There are big rocks to climb on, and lovely shallow wading on a hot summer day!