I felt very awkward giving a tip to a teenage girl at my kids’ day camp so I gave it to my kids to give to them (they are not the type of kids to hold the tip hostage).
It also goes the other way. One summer I was going home for the weekend after visiting day so my parents didn’t come up on visiting day. My counselor mentioned to me that I should “remember to bring something back” for him. And no, he did not mean a burger from Kosher Delight.