Just one more suggestion, Fibula: You will probably receive more responses if you ask at the Help Forum to have the thread title changed to "Vacation ideas (USA) wanted!"
To us in the US, "holiday" usually means Christmas and Easter and Thanksgiving and so forth. Americans scanning the thread titles probably won't interpret this thread as a request for "road trip" suggestions (I sure didn't!).
Anyway, as long as we're on the subject of road trips, why not check out Roadfood.com for some interesting places to eat along the way? http://www.roadfood.com/