Most people eat A LOT of food and then settle in to watch football. This is all after many people also watch the Thanksgiving Day Parade from New York that morning. I will say I have never been a person into parades. I find them boring to watch - especially on TV!
When it comes to food, I try to keep myself in check so I don't over eat and feel like crap the rest of the day. As for football, I am not one for the NFL, so I prefer to watch a college game. I generally spend the afternoon TRYING to stay awake after eating. Keep in mind, this is even watching what I take in to try to not pass out after the big meal.
I almost always fall asleep for a couple hours, wake up groggy, maybe fall asleep again, wake up, try to play a game with family, then go home before I fall asleep yet again! Happy Thanksgiving!