In reply to HakanT:
> The Gunks in upstate New York has the best trad climbing in the East.
Debatable, but only because there is so much quality climbing in the Adirondaks and New Hampshire too. It is awesome though. And definitely has a very high concentration of quality routes.
Also the Adirondaks in upstate New York is a wilderness area larger than Wales and has loads of Rock Climbing. A particularly good day out is Rogers Rock.
http://www.mountainproject.com/v/rogers-rock/106092131
Acadia National Park in Maine, is a beautiful area with sea cliff climbing, You could combine sea kayaking with the climbing. There are also massive and cheap (relative to the UK) lobsters.
You could hike the Aappalaichan, New England or Long Trail. There is also loads of Kayaking, white and flat water. In fact there is so much water in the NE compared to the UK, you can always finish off a hot day climbing with a nice swim.
Beer and food are really good in Vermont, and is the most beautiful state in the NE in my opinion, however doesn't have as much rock climbing as NH or NY. There is some but I haven't done it, mostly been there fore skiing (sorry not much help for you in August!)
For partners try Mountain Project. I would offer but I climb nowhere near your level.
You're right about needing a car, however depending on your personal car insurance and your credit card, you can hopefully avoid taking out the companies rip off insurance/damage waiver/excess protection that can double your cost. Also worth going with a big company like Enterprise as it's easy to swap out a car wherever you are.
RE your gear, if you fly with Virgin they give you a free bag for sports equipment, I phoned them when I came of and they were fine with including climbing gear (they didn't even check it). So as long as you are renting a car, which you should be, it shouldn't be a hassle to bring your rope. I'd advise it, especially if you prefer doubles, most people here use singles, unless climbing something requiring a long abseil.
Damn, climbing season is just getting underway here after a long, cold winter and writing this has made me sad that I have a torn rotator cuff
Post edited at 16:41