Another newbie here - hi!
They will get pins that say "My 1st Trip" to wear, and they will get lots of attention showered upon them from CMs. It could be anything from a few kind words, to a free popsicle, anything like that. It's just something small but can make the trip special for the kids. When my kids had those pins for their 1st trip the charaters seemed to interact with them a little more, maybe it was in my imagination, but it seemed that way.
Anyways I'm guessing that's what they meant - who knows - maybe it's something even bigger & better!