Tell us more about him - hobbies, interests, activities, etc. It's hard to give suggestions just out of the blue!
You could always do a really nice meal for him. I know someone that fixed a prime rib (if you shop around, you can get good buys on the meat), fresh vegetables, homemade bread, and a homemade keylime pie (my mouth is watering right now!). That with candlelight and soft music is always a winner.
But, you need to tell us more about him for us to give you specific things you could do/buy.
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Cats know what we feel. They don't care, but they know.