you can actually catch some bass in the connie right in town. I have also caught walleye and have seen a musky. However, the best bet would be slippery rock for bass action. with the cooler early summer and extra rain there will also be a fair number of trout left. the McConnels Mill state park area would be the best bet for trout.
you will also have a good shot for trout at neshanock cr which is near Volant, about 30 min from harmony.
if you like largemouth. lake arthur is 20 min away. you can rent kayaks or a motor boat, and fish the weeds with a good chance to get a few fish with poppers or bunny leaches. I have actually wet waded arthur and done well too.