Hi bq41, welcome to the forums!
A lot of us are fighting holiday weight gain alongside you. It's natural to eat a lot during holiday feasts, so my first bit of advice would be not to focus so much on dieting during Thanksgiving and Xmas eve! Those are days to enjoy a good warm winter meal with your family. Ever heard the saying, "it's not so much what you eat between Thanksgiving and Christmas that matters, it's what you eat between Christmas and Thanksgiving" ?
If you can commit to eating more healthily (and there are plenty of others on here that can give better tips about that than I can) then I will tell you this: move more. This means, when you go to the gym, walk for 45 minutes, not 30 minutes. Instead of 2-3 machines, use free weights and do 4-5 exercises instead. Don't use any weight that's less than 5lbs. You won't bulk up. Trust me. See this woman?
She's squatting 225 lbs, which is more than I can squat, and she's not bulky at all. (You can ask a trainer to teach you the movement).
It also means move more in your day-to-day life. It's easy to get caught up in the idea that exercise can only happen in the gym. But this couldn't be further from the truth. Take the stairs instead of the elevator. If your grocery store / post office / bank is less than two miles away, walk there instead of driving. Rearrange the furniture in your house. Anything that gets you moving is exercise!