This park has a unique water feature: two large "Mushroom umbrellas" spray water, then it runs down a "stream" to a small "pond" area where even babies in diapers can sit and splash.
The playground equiptment is for a bit older kids, though...my four year old was a bit intimidated by the slides and climbing net.
But we go for the water anyway.
Water feature open Memorial day-Labor day. Also have activities in the evening (puppet shows, concerts, etc.) in the summer time for families.