Are your little ones enrolled in any camps that do field trips? I enrolled my 4 year old in a daycamp with the city and they do a few field trips. One trip is to the zoo (which is enormous) and they'll do a weekly field trip to a park or beach.

At first this sounded really fun, but now I'm really concerned about the ratio of campers to adults and how they'll keep track of everyone. There's not really a way to talk to the camp organizers beforehand to get any peace of mind.

Has anyone used any technological solutions to keep track of their little ones?