Since y'all are going during November or December, I would look at Florida beaches where it is a bit warmer. With that many adults and children, I HIGHLY suggest looking at renting a vacation home.
My family has rented two vacation homes in the past two years (one on the North Carolina coast and one down in the Rockport, TX area) and we REALLY enjoyed them.
The houses we stayed at are:
* Very roomy so my two daughters (7 and 3) were able to run around and play;
* Had regular, full size kitchens so we saved $$ by eating breakfast, some lunches, and some dinners in;
* Had washer and dryers so it was easy to do laundry (which means you don't have to pack as much);
* Had fabulous intra-coastal waterway views and our own private piers to go fishing;
* Had internet access so my husband and I were able to still do some work (we own our own business);
* Close to local attractions, stores, and restaurants;
* Plus a whole bunch more.
We never felt confined like you do in a hotel room. The weekly cost may seem expensive but if you divide the cost amongst three families, it really isn't expensive at all. Especially, when you look at all the amenities that you get.
The best website to look for vacation homes all around the world is http://www.homeaway.com This is the site that I have used for the homes that I rented. We have had great success with this approach.
Hope this helps!
K.
Dripping Springs, TX