We were fortunate enough to go to Islands of Adventure during its final Park Preview Week, and the actual day we went on was "media day", so we saw dozens of celebrities.
There was a spate of TV commercials, holiday programs and Universal promotions being filmed, so we saw the likes of Gina Lee Nolan on several occasions with a tv camera in front of her, talking about a ride etc.
We also saw Harrison Ford, Steven Spielburg, The old chap from Jurrasic Park whos name escapes me, a special outdoors episode of Jeopordy or something like that being filmed, and several others who I cant remember or didnt know. They were all being given tours by Universal staff, so were easy to spot.
But the funniest one of the day (and I hope my father in law doesnt read this and see's me tellign anyone this), was after we went on Dueling Dragons....we were walking out of the dark exit tunnel, when coming towards us came a Universal guide with Eddie Murphy and around 15 of his hangers on.....all dressed in black and all wearing shades (in the dark)....obviously being let on the ride the quick way so they didnt have to queue.....and my father in law, not recognising him whatsoever said "isnt that good how they are letting those blind people on without having to queue"
hehe.