a Japanese cat relic?

 I could use some advice. 

We've got a short trip coming up. Dogs will stay at a local kennel, and the cat will have the house to himself. I feel okay leaving the cat for two or three days with a gravity feeder, big bowl of water, and a pristine litter box at the ready. This trip will be slightly more than 3 days, and I asked my friend/Boss - a card-carrying cat lover - if he wouldn't mind checking in on Napolion, our cat.

He accepted the mission, said he's got nothing else going on those days, and would be happy to do it. He lives just a couple of miles away, too, which is why I thought to ask him. Normally, I would ask a neighbor kid, but I honestly don't currently know any neighbor kids well enough - a ramification of empty nesting, I suppose.

With a neighbor kid, I would just give them some cash. But what to do with Boss friend? Feels cheesy to give him a gift card or such. 

Any suggestions?

For reference, he's about 60 years old - a single (never married)  history buff and Japanophile. Likes to read (history and Japan, duh), hike, and bicycle. Oh, and he's rather fond of cats.

I'm drawing a blank here.