I think, with a plan, you will be able to see all four parks. I would hate for you guys to come all that way and not see the Animal Kingdom.
I would concentrate on going to one park per day and plan on spending all day at that park.
I don't know if you are aware of it or not but you can actually arrive at and go to a certain point within the theme park all prior to park opening. Say, for instance, the official park opening time is 9:00 a.m. By 8:30 a.m., you should be able to enter the park. At a certain point, you will see Disney castmembers asking park guests to stop or they will be holding a rope. When the park officially opens, the castmembers will drop the rope and the guests are allowed to continue on through the park. This is what Disney refers to as "rope drop".
Disney also has Extra Magic Hours (EMH) for Disney resort guests.
Since you are staying onsite, you, along with other Disney resort guests, will be allowed to enter certain parks (on certain days) one hour prior to park's official opening time. This will allow you to ride and see attractions prior to other non-Disney guests.
You will also be allowed, to stay in the parks after the park's official closing time. When we were there in June, 2006 and June, 2007, we were allowed to stay in the park 3 hours after park closing. We were able to do LOTS of things over and over again.
When it gets closer to your travel time, go to
www.disneyworld.com and check out the park hours on the calendar. You will also see the Extra Magic Hours calendar.
I would also suggest that you spend some time on these boards or over at
www.allearsnet.com checking out the various rides and attractions that are best fitted to your party. Make a list of the things you really want to see and a list of things you would like to see if you have the time.
Also, find a good park map for each theme park. They can be found on these boards and on
www.allearsnet.com. Familiarize yourself with where your 'must sees' are in the parks.
Fastpasses are available for the major rides at each of the theme parks. Read all you can about Fastpasses because they will save you a ton of time if used correctly.
There are lots of really good guidebooks out there too. My favorites are the Unofficial Guidebook to Walt Disney World and Birnbaum's Official Guide to Walt Disney World. The Unofficial Guide has very detailed descriptions of the rides, ride wait times, etc. But, I have found that the Unofficial Guide is sometimes harsh in their thinking so take some of what you read in stride. I counter-balance the harshness with the Birnbaum's book. It is sappy and happy but it does provide some helpful information on planning your days.
You should be able to find both of these guidebooks on
www.amazon.com or on
www.booksamillion.com.
I also like to tell first timers to know, before going, that you will never be able to see and do everything Walt Disney World has to offer. We have been 12 times in the past 10 years and this year was our first time to ride the Liberty Belle steamboat, to see the American Adventure and there are still some shows in Epcot's World Showcase that we haven't seen.
With all of the above, I sincerely believe you could see most of all four theme parks in your time frame. You're going to come home from your WDW vacation tired but you won't regret it.
Please let me know if you have other questions. I would be glad to try and answer them.
Lisa