A nice bottle of 12 year old single malt scotch is always a good choice. It should be available for around $50 at a local store.
Dinner, sit down, he'd like to hear from you.
You should combine cpgnatly and DozerDan's suggestions.<br />
Sit down, and drink a nice bottle of single malt scotch with him.
A card for starters, Take him out to dinner or something too
It all depends on what he likes. Maybe squeeze it into a conversation without being too obvious.
what does your Dad like? sports, cars???