I've all ready made the trip this year last Spring Break. I got to IOA ,WDW, and MGM. Out of all of them IOA was definatly the best. Rock N' Rollercoaster is cool with the music and everything but also be sure to get on Tower of Terror. That thing is a blast! I didn't go th BGT since I went there before (but it was before Gwazi was built).
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Parks for 2000: SFEG,IOA,MGM,WDW,PGA,SFMW,SCBB,Lakeside.