East River
Gerry - Get yourself a copy of Eldridge's at West Marine - about 12 bucks. Worth its weight in gold when trying to plan tides and currents. I've used it for a couple of trips through the East River - it's a must-have.Basically, when traveling north on the river, you want to be at the Battery at low water or shortly thereafter so you can catch the flood tide going north. The current between Roosevelt Island and Manhattan can get wicked strong - better than 5 knots at times, so you don't want to be traveling against it. By the way, do not take the east side of Roosevelt Island - you may not make it under the bridge. Stay between Roosevelt and Manhattan. When heading back south, you want to be in the vicinity of the Throgs Neck Bridge when it's high water at the Battery, so you can get flushed southbound.People tell horror stories about Hell Gate. The water is turbulent, and yes, I have seen what look like whirlpools to me, but traveling through it is no problem at all as long as you go with the the current and not against it. Watch out for debris in the area - floating telephone poles, desks, etc are not uncommon. Watch for the commercial traffic, especially the high speed ferries. Most of all, watch the skyline of the city - it's a beautiful trip.Can't help you with marinas - I've heard that Liberty Landing in Jersey City, just opposite lower Manhattan, is a good stop.Have fun...