come in late October.
3rd weekend features the Scottish highland games with people in costumes, marching bands, dancers, athletes, vendors, and plenty of photo ops. It is also usually the first really cold weekend in the morning so don't be fooled by the 75 degree days 3 days before.
The leaves should be turning by then so they make nice colors on the lakes.
For B&W shooters there is the covered bridge and some interesting twisted trees on the walk up if you get off the path some near the top (just don't go over any edges). Small rock formations are on the back and sides of the mountain on the hiking trails.
Nearby is also Arabia mountain which has other interesting features but is much flatter.