Gift for Client

Hey sitters! I have a wonderful client I’d like to leave a gift for when I leave this sitting I’m doing . It’s a long sitting with a big payout and the clients are just wonderful. I’m going to leave a card and some treats for the dogs but I’m blanking on a gift for the owner. Chocolates? Cheese?

I’m an over thinker and I don’t want it to be weird. Also is it weird to leave a gift? The clients mentioned they wouldn’t be traveling as much and I just want them to know how much I appreciate them, they have been truly great to work with.

Any ideas?