Lake Wallenpaupack

[Rickhem]

I've fished that lake for years, decades even. My parents have a house up there and the lake has done nothing but get busier and busier as time goes by.
First, it seems to be mostly a night fishery due to the boat traffic you saw yourself. And a Thursday night is often best after the lake has had a few days to calm down from the weekend. I've had good success throwing topwaters in by all the boat docks that line the lake. The lake is like glass at night and the plop-plop-plop of a jitterbug catches even in 20-25 feet of water. Walleye I catch trolling stickbaits or just hopping jigs along the bottom out in front of the state park campground, in front of the high school, or by the dike (although you lose a lot of stuff in the rocks by the dike). I havent caught any stripers even while drifting herring out in the open areas, but they do seem to show up on the fishfinder.
Sounds like you were fishing during one of the algea blooms too. That is probably two and a half strikes against you before you even started. Tough to fish in that pea soup.
Even the local clubs that used to have tournaments there would have them at night.