As most of you know my wife and I are going with my boys and their family to Disney World the week before Christmas. I have asked several questions already about equipment to use and now I have another one. This will probably be the only trip we ever get to take together like this and I want to make sure I am prepared, so please bear with me with all these questions. I have looked at hundreds of pictures on line and was wondering just how useful a polarizing filter would be. I came across this set of pictures and was wondering if the pictures in the link below were just metering error or is it something a circular polarizing filter might have helped?

Disney's Share A Dream Come True Parade photo - Bill Myers photos at pbase.com

I do not have any experience using filters so any info you may give that would help out on our trip would be great. The simpler the better. I was thinking of getting a screw on circular polarizing filter that screws on because the three lenses I will probably be using are all 77mm. I purchased the Cokin System with the ND filters and the C polarizing filter but I think they will be to much of a pain down there. Will this one filter cover most of my needs? As always, if you have any ideas or suggestions please reply, Jeff