Usually I write a Thanksgiving note/letter to my teachers. Some years I give them a little treat of some kind.
Our school district always provides each staff member a free ham/turkey dinner the day before break. Just a little bit of decoration can spice this up. This year my treat will be a hot chocolate bar with all the trimmings. In the morning they can treat themselves to a hot chocolate treat then for lunch they will enjoy a free lunch compliments of the district.