Tim,
If you are floating the main stem and catch a trout (at current temps) you might as well toss it on the grill. Even if it swims away, very good chance it will die shortly after release. I'd focus on long eddy to callicoon for warm water species. Beeber will back me up that the smallie fishing is top shelf all the way down to port jervis. If you want trout and bass, upper 3-5 miles from Hancock to Buckingham.
The west will have cold water so trout is the game. Some of the deep pools (balls eddy & the home pool) hold good walleye too but you have to drag the bottom. If you go up above the gamelands, both banks are in NY so you must buy their license. Sulphurs hatch all summer on the tailwaters. Some sections have a hatch at 10am and others have a hatch at dusk. If you can't see anything on the water but the fish are rising steady....could be "the fisherman's curse". #28-32. If that's what you see....leave and find another spot. Terrestrials aren't a huge deal like on smaller streams but they will work. Trico hatches are spotty at best in the mid section but are fishable in the lower part and in the junction. Cahills every night and iso throughout the day. Nymphing is almost always productive.
As Jason mentioned, you will need to throw 50-60' casts with a long (15-18') leader. Not for every fish but a majority of them. Expect to land a low percentage on 6x since the average 16"+ . No more free info. You need more help, PM me.
Good chance I'll be there for 3-4 days with NJ Tom at the beginning of August. You will also want to consider the Catskill jam in October. It's under the "events" section. You can get all the info you need first hand from some good guys and good fisherman.
