This reminds me of a very unpleasant tiff that we've been recently involved in with a local business. The business was operating too loudly outside of the hours that it is legally allowed to (and was violating several other laws), and so a group of people who live nearby brought it up with the appropriate government officials so that we could get some peace and quiet at night. Since then, we've been threatened and publicly mocked by patrons of this establishment, who accuse us of "not researching before we bought a house" and "trying to shut down a small business." Actually, guys, we just want you to be quiet when you're supposed to be quiet! I think adults like that raise children like those.
It seems like noise is especially controversial because what seems fine to me might bother you. Honestly, though, kids aren't always great at situational awareness, so if there were children running up and down the hall and I wasn't already in my pj's, I would stick my head out and tell them that I was trying to go to bed so please stop running. "Hey guys, I know you're having fun, but the running is keeping me awake. Do you think you could stop for tonight, maybe pick things back up again in the morning?" I used to work with teenagers at a residential summer camp and boy did those kids get loud quickly, and they didn't even realize it. In the situation I described above, several people made polite and neighborly inquiries with the business owners to ask if they could be more respectful, and no one brought it up to a government authority until that proved to be repeatedly unsuccessful. I think the same idea applies here...as long as you're comfortable with doing it, I would try a simple request to the parents or kids before I escalated the situation to cast member. That said, I also wouldn't feel bad going to right to a cast member about the issue since it's my vacation, for crying out loud (or quietly?!

). But as people mentioned earlier in the thread, by the time a CM made it to my room, the kids might be gone.
Most of us recognize that not all kids are badly behaved, but it's the vocal minority that always gets all the attention!