Don't wait to long if you haven't booked trip if you are planning to stay on Disney property it is quite crowded. I would suggest to get the park hopper option on tickets it allows you to hop to different parks the same day. When you go to magic kingdom open the park the crowds aren't real bad in the morning but by early afternoon it gets crazy crowded. You can go back to the hotel and take a break or hop to another park. I open every park I go to and do what I like to do. Just be ready for the crowds and heat you will have a great time. It's a magical place. Just wing it and have fun.