Well, I'm sure your dad would appreciate anything you give him with love and thoughtfulness. But, if you're looking for some gift ideas, here are a few suggestions:
1. A personalized photo album or scrapbook with memories of your time together.
2. A watch or jewelry with a sentimental message.
3. A cozy sweater or a comfy pair of slippers.
4. A book or a DVD of his favorite movie or show.
5. A homemade gift like a painting or a poem.