We travel each year on Thanksgiving and our plan has been to get to the parks at opening and leave midday for a rest/swim, dinner then back for nighttime shows. We usually arrive the weekend before Thanksgiving so we do have a few "quiet" days before the crowds arrive--usually starting Tuesday--heavy on Wednesday. We have always gone to AK on Thanksgiving as we find this park less crowded. First year we did MK on T-day and it was WAAAAAYYYY too crowded. This year, it's our off day and we'll hang at the resort and DTD. If you are still planning which days you will go to which park--I'd pick Thursday as my waterpark day/ DTD day/ even Disney Quest day. We leave the Friday after T-day so I can't comment on surviving the weekend!