In 1/06 I took DS (turning 10 at the time) for a quick weekend away and did tea for his birthday. It was the highlight of our trip and he still talks about it. He recieved a crown and cupcake. Our server played it low key as I knew DS would not want to be embarassed. I would definitely have them make a note. ALso, reinforce the note when you check in at the podium.
Hope this helps.