As far as I know you do have to pay park admission because the show takes place on the Seven Seas Lagoon in the middle of the park where Future World and the World Show case join. You can see the high fireworks from several places outside the parks, but the rest of the show is on the water so you have to be there to see it all. What age group do you have? If you are only going to one park you might want to make it EPCOT anyway depending on who is going. MK is what you expect to see when you go to Disney, all the classic rides, atmosphere, etc. I just took for granted that you were going to have a pass to be able to go into more than one park. Sorry for that assumption. If you need help on which park to pick, there are lots of opinions here and we would all be happy to answer any questions you might have.