Wow Butch, you keep talking like that and we'll be visiting you at Helen Hayes! Tell Caryl I have some new towels she may want to try out, they make the wax come off easier[:-bunny]
Rob, the fireworks at Rondout are held the week "before" 4th of July, but like Butch said, Dan may know of some other shows there. Remember this year the holiday is on a Wednesday so someplaces are having displays before or after the actual holiday. Poughkeepsie will have a good show on the 4th but its coming back down the river, you'll start to feel like a yo-yo.
Once you go under the I-84 bridges (2) the river is going to get narrow and there are a few marinas, mainly on the east side, which post NO WAKE zones. The one referenced above is the Pirate Boat & Canoe Club. They have a couple of heavy hitters on their member list so they get good coverage. You will pass a rock quarry about 5 miles above the bridge and then the club is about 2 miles farther up; at Poughkeepsie you will go under an auto bridge and then a rail bridge, then about 3 miles up you hit a left bend in the river, as you come out of the bend there is a NO WAKE zone immediately to starboard - Rogers Point - nice club/really good people whose boats get hammered! Another 2/3 miles up is Poughkeepsie Yacht Club to starboard but if you are in the channel you may not even notice it. At this point there is an island in the river, make sure you pass with the island to starboard, although the real danger is ahead, but they already told you about the Lighthouse.
Hope your reservations get filled, its a beautiful spot.