Which Disney park to go to?

We are going to Orlando to visit my daughter's friend that moved away. We are also going to Disney for a day. Which park do you think we should go to? Should we get park hopper? Is it worth it? She likes Magic Kingdom because of all the original rides, Animal Kingdom because of Dino land and the little cities, Epcot for the countries and Test Track, and Hollywood Studios for Tower of Terror and Rocking Roller Coaster. I just think that if we got park hopper, we wouldn't get to be at each park for very long. What do you think?