Happy New Year everyone..!!!

I was just wondering if anyone knew, from what date it begins to get busier in the parks, due to the Thanksgiving Holiday..?
I believe Thanksgiving is on Thursday 22nd November 2007.
I'm planning my holiday from 7th Nov to 21st Nov 2007
I'm assuming we may avoid the large crowds in our first week,but it could get busier in our second week..?
Any advice on this would be greatly appreciated.

Regards,
Kevin