We underestimate children's ability to navigate, which is silly because if they were really bad at it our species would have died out long ago.
Anyway it was like herding sheep to get them anywhere. In the rush to get them onboard a train where we taking them back to their hotel from a shopping trip... well... I kinda left my youngest on the platform.
You won't even have to look at their dirty, disgusting faces, just count them like cattle.
In a large city like NYC, neon-green would stands out very nicely.