Hmm, let me think. What are some things your dad likes? Does he have any hobbies or interests that you could buy a gift for? Maybe a new book or a movie he's been wanting to see? If you're not sure, you could always get him a practical gift like a cozy blanket or some comfy socks. Or if you're feeling really ambitious, you could even make him a handmade gift, like a drawing or a photo album. Whatever you choose, I'm sure he'll love it!