Tightlines, I've never fished an egg attractor pattern in the park, but I'd bet anybody $20 that I could catch fish with it on a nice summer day.
Jim is dead on with the terrestrial recommendations. One of my favorite setups is to drift a dropper of some sort under a grasshopper pattern. I've also had a lot of luck fishing a yellow jacket pattern... and a lot of bad luck getting stung by those bastards! They're all over the park, so I'm certain that's a good fly to use in the summer!
I got no style, I'm strictly roots.