The fountain by the park is very nice to sit around and catch some mist when the wind picks up on a hot day. I even saw some people sticking their feet in front the edge cool off a bit. The park had what seemed like an outline of the fort in the one section and there were tons of benches to sit on spread out throughout the area.
The park itself was very clean and they had some flushable port-o-potties with hand washing stations setup since the art festival is this week. Everything was foot operated which I thought was smart.
The views from the park over the river to the Heinz stadium and towards the houses on the cliff in the other direction were beautiful. Nice quiet place to hang out.