The hardest part of Thanksgiving with kids is keeping them entertained until the meal is ready. There's usually a long wait between when guests arrive and when the meal is served. For adults, that's precious time visiting with people you probably do not get to see much; for kids, it's "booorrrriiinnnnggg!"
Having a few fun activities for the kids helps keep them busy (which means less whining or running around like crazy people) and eases the boredom factor. The uncle and aunt we spend Thanksgiving with live on a huge wooded lot, so my uncle takes the kids out for a walk in the woods. Giving older kids jobs is also good....they like to help and it's not that hard to stir up stuffing or set the table.
Crafts are fun too: the one in the picture is one my family did. The kids drew and cut out turkeys, and then created a disguise for the turkey so he wouldn't get eaten on Thanksgiving (the green thing is a bush for him to hide behind). Another nice idea is a thankful tree: Put a tree branch in a vase and have kids cut out leaf shapes, then write something they are thankful for on each leaf. This can even serve as a nice centerpiece.
How do you keep kids amused during the wait for dinner?