Even a book on tape would be nice. There was a couple times when my Dad was elderly and living in his own apartment, I made up a box of assorted groceries that I knew he liked and would be easy for him to fix. I included 2-3 cans of his favorite soups, a couple cans of pork and beans, a couple cans of chili, a box of saltines, a loaf of bread, a four pkg of toilet tissue, a box of facial tissues, a roll of paper towels, a pkg. of chocolate covered candy called old fashioned drops, which had always been one of his favorite candies, a pkg of cookies. I also included a pkg. of styrofoam bowls, so he wouldn't dirty a bowl when eating his soup or chili. He really enjoyed these boxes.
My dad is in his 90s and we have found that paying for the things he needs, but thinks are too expensive, works well. His idea of prices for services is about 20 years out of date, so snowplowing, lawn care, and a newspaper subscription, are some of the things we do. We make up 'gift certificates' and put them in gift bags, and then he has something to open on Christmas Day.
We'd love to take him out to eat, but he doesn't enjoy it. So we make meals and bring them to him, or go to his house and make a meal with enough leftover for another meal.
Enjoy the time with your with-it Dad, it is priceless.
Is he still able to read? A good book in large print (if necessary) might be nice.
Bucket List? Skydiving? Gift certificates are always nice what are his interests? The food idea is good but there could be so many different things. Hope you find something that's just right. Merry Christmas Happy Holidays etc.