If it’s a big trip, we may buy souvenirs for a few select close friends and/or family.
My mom used to always get us a souvenir or two when she was on a big trip, meaning a trip abroad to Europe or something. It would be something useful like earrings or some beautiful silver candle sticks or something like that.
We just took a trip out west and I let my daughter buy some magnets and things for some of her friends.
My family will also send post cards. Post cards are not too common now, but I think of them as a sweet way to show you’re thinking of someone when on a trip. I sent a few post cards to family when on our past trip out west this summer. I treasure post cards I have received from my mom and others in the family. Nobody else seems to send post cards but they’re fun and inexpensive.