Here are some things that might also help.
If you are staying on site you can request a key card just like the one mom and dad gets. They can have Activated or not it is up to them. But what is nice is that it has their name on it and where you are staying. Sometimes when you are upset you might forget these things, so it is a good reminder.
We always pick easy to find and uncrowded places to meet if we get seperated. Cinderalla's fountain by the castle is good. It is not very crowded by it so it is easy to spot others, compared to places say on Main street or the front of the park. Unfortunately though it is now a designated smoking area so it can really be stinky!!!
The one rule we have for our DD is if she does loose sight of us she is to plant her feet in the ground, grab onto something like a post or fence and sream at the top of her lungs for us. And not mom or dad, but our names!!
The worst thing really is to run around trying to find your parents. They could be looking for yu and you each keep missing each other. Have a rule. You stay put for say five minutes. Then you go to the meeting place. If know one shows up in say 15 minutes, you go to the lost parent center, or find a cast member to help you. Never go anywhere except with the cast member.
Most importantly let others in your group know you are concerned about getting spereated. that way everyone can work together to stay together.