Whether you're working and need a quick bite, your family or friends are working or traveling and you can't meet up or you otherwise just need a place to go this Thanksgiving, there are several restaurants open on Thanksgiving Day that you can visit for a hot meal. Many other restaurants also help feed meals to those in need (I know KFC used to do this where we live) so you might want to check locally if you want to volunteer on Thanksgiving instead.
If you're looking for a meal, restaurants like Bob Evans, Waffle House, Cracker Barrel, Tucano's Brazilian Grill and many others are open. They may vary by location so be sure to check locally to make sure that your nearest locations are open. Many fast food locations are also open on Thanksgiving if it's just another day for you and you're not interested in a sit-down meal, but some of these places are also great to either take friends for a no-cook dinner or to pick up take-out and cook it at home.
What are your Thanksgiving plans?