For Hyde Park, I know nothing about fly fishing but I had good luck with JustJiggers advice by throwing a T-rigged baby brushhog. I had even better luck once I swapped to a C-rig, but I think that has more to do with the angler than the preference of the fish.
I was also catching a good amount on zoom lizards, zoom flukes, strike king perfect plastics finesse worms, and 5" Yamamoto seinko's.
The colors I had good results with were Watermelon red flake, watermelon magic, Green pumpkin black flake.
A word of advice, over the past week the vegitation has really taken off. Anything North of the bridge that crosses the lake is tough fishing off the bottom. T & C rigs get choked up with weeds on the weight. Drop shot seems to be the best chance, but I don't have the patience to fish a drop shot. If you stick to the southern end near the waterfall you shouldn't have those issue. That's where I've caught a majority of my LMB.
I fished the two Lancaster ponds on pavement last weekend. Didn't have any issues, I've heard it's not as "enforced" as it used to be but i have no previous experience.