Just wondering, my parents are going on our upcoming trip to IOA. They always ride the roller coasters at MK and MGM. We have never been to IOA and are looking forward to our first visit. I know that Hulk and Dueling Dragons are more intense, but do you think they will be o.k. to ride these at IOA? They both loved the RNR at MGM and they love all the coasters at MK, but I don't want to put them on a roller coaster that is going to cause a heart attack!!!! Please give me your opinion!