Back when I worked at Blizzard Beach on a College Program (spring 2002), most days they would have a small opening Ceremony. Of course this could of changed in the 4 years since then.
Every morning a Ski Captian would be picked from the families waiting at the turn styles before the park opens. This family would be then let in and givein a free locker/drink cup etc. and then led to their own reserved picnic/small pavilion area where they can put their items not left in the lockers. Then the ski captin would be sent up to the top of summit plumit.
Everyone else would start to be let in about 5-10mins to park opening, but the bridges over crosscountry creek woud be roped off (access to the shops and towel/locker rental would be opened).
At park opening time, the crowed of people at the bottom would do a count down to park opening and at zero the ski captin would go down the slide officaly opening the park.