I agree with the others here that, while some people can use their PDAs/phones inappropriately in some social settings, it certainly should not be up to an amusement park to dictate such a ban. (Of course, they can make whatever rules they want for their property, but I would avoid them or force them to kick me out when I ignore such a stupid rule.
)
I for one have had the opportunity to spend "quality time" (and LOTS of money
) at a certain mouse themed amusement park because I was able to take my Pocket PC with me and read and respond to emails while waiting in the various lines. Most of the time, there were no new messages and I could focus on my wife and 6-year-old. But if I couldn't stay in touch with the office, then I wouldn't have been able to take the family on a weekday.