Its got to be either Universal Studios or Sea World.
Universal Studios has some of the best attractions today including the Revenge of the Mummy and Jurrasic Park while Sea World has soo many animal exibits and shows that I grew up enjoying.I could stand watching the Sealions all day.
We try to get to Sea World in Orlando at least once a year. They usually let us in for free since my husband is in the military. My younger son would love to work with the Orcas when he grows up. They are his favorite animal.
I live near Pittsburgh and we have a great park here called Kennywood. www.kennywood.com It is very old with lots of old rides and wooden roller coasters. The trees are huge and the food is great. We try to go every year and support the local park.