I like to plan out which park I plan to spend the majority of my day at. Definitely make dinner reservations before you go! At Disney, they aren’t even actual reservations, it’s more like call-ahead, but without them you will find yourself waiting for hours or eating burgers every night.
Plan on spending a whole afternoon/evening in the World Showcase of Epcot, especially if you love food and drinks. We like to do “drinking around the world,” and have a drink in each country (you definitely have to pace yourself though!). Definitely get Fastpasses for Soarin’; it is the best ride in Epcot, with the longest lines.
Animal Kingdom–get there early if you want to see animals on your safari; most of them nap during the day to escape the heat. Animal Kingdom can definitely all be done in one day, or even less. Everest is my favorite ride in all of Disney, and the Lion King show is one of my favorites as well. If you’re not really into animals, there are still rides/shows, but you will get done a lot faster.
Hollywood Studios has the best “grownup” rides–Rock n’ Roller Coaster, Tower of Terror–but it also has the longest lines, the least amount of shade, and the worst layout (in my opinion). I usually spend about a day and a half there on my trips, and could probably squeeze it into one day. They have a nighttime show called Fantasmic (it’s not really a fireworks show, although it has some fireworks in it) that is FANTASTIC. Get there early though, because it is limited seating and fills up fast. We sometimes get a counter meal dinner and bring it with us to eat while we wait.
Going in June, I would recommend hitting up one of the water parks. I have only been to Blizzard Beach, and liked it well enough. Your hotel will have a pool too, so if you don’t want to spend the extra money on the water park, you will be fine.
Magic Kingdom is obviously the best park, and will take up most of your time. Different people have different approaches–some like to run to Frontierland, where the rides with the longest waits are, and do that first. I have heard that if you go counterclockwise through the park you will have less wait time on most rides, since a majority of people go into the park clockwise. Go on the “little kid rides” (Small World, Peter Pan, etc) at night when the kiddos have all left the park for shorter waits.
For adult entertainment, there is a dueling pianos bar at the Boardwalk that can be fun (depends on the crowd that night). I think there is also a dance club at the Boardwalk, but I have not been. There is also an ESPN bar at the Boardwalk if you want to watch sports. Downtown Disney is ok–I really like the Ghirardelli ice cream shop, and Earl of Sandwich; you can also do all of your shopping in Downtown Disney instead of having to lug things through the park.
I’ve been dying to get back to Disney (my family used to go a lot, and my husband has never been!), so I’m super jealous. You will have a great time!