Hahaha! I'm so glad someone else does this! I'm a homeschool grad and my mom would count Disney as several days of school - all my traditional-schooled friends were soooo jealous!
Basically, you need to check on the requirements in your state for what counts as a "day" of school. For example, back when we were worrying about this, my state required either 1) lessons in three separate subjects or 2) three full hours of one subject to count as a day.
So, my mom would have us bring schoolbooks in the car with us and do three subjects (sometimes more) while we drove to FL and back. That's two days.
Then, Epcot was geography, science, art, social studies, and history. And we actually did learn stuff! She would quiz us while in line or explain stuff to us about whatever ride we were just on or waiting to go on.
Animal Kingdom wasn't open back then, but you certainly could count that as over three hours of animal and conservation science.
Magic Kingdom was a bit more difficult. When we were younger, it would be a day of PE (like field days in traditional school) because there was so much walking and stuff, but when we got older, we just didn't count the Magic Kingdom as a school day.
Honestly, I don't remember what we did for MGM. There used to be a tour of the animation studios, which would probably have counted for art. Now there's a Walt Disney museum (history!) and a Prince Caspian exhibit (literature!). Throw in some flashcards while in line and it seems like a good school day to me.
The way my mom made this to where we actually learned was she would tie what we were seeing and doing in the parks to what we were learning in our lessons at home. What you can do, since you've got a little bit of time leading up to your trip, is you can do some "unit studies" that would culminate in the "field trip" to Disney World.
For example, you could have your students read the original Little Mermaid story, then watch the movie, and compare. Then go to the Little Mermaid show at MGM and discuss how it compared to the first two (while in line for your next ride, of course) What are the differences in the three mediums? Which one did they like best? Why?
Another example: Have your students read about a certain animal that they will see at Animal Kingdom. (Where does it live? What does it eat? How can you tell that it's a mammal? Is is endangered?) Then, they can go visit that animal during the trip and tell the rest of the family all about it.
Another example: The "big ball" in Epcot has a ride inside that chronicles the development of communication. You could have a few lessons on milestones in communication technology before you leave, and then challenge your students to find all the things you studied on the ride. In line for the next attraction, talk to them about how those milestones fit into the overall time line of the ride. (There's also a hidden mickey in the stars to look for, too). That might be over the head of your K-5 student so take him/her to the Imagination Pavillion for an art lesson. This is still one of my favorite rides! In the lobby they have some interactive stations where you can learn about mixing colors and making music.
Last example: Unfortunately, the Hall of Presidents will probably be closed while you're there - that's the most educational attraction at Magic Kingdom. So I would recommend studying unique characteristics of different cultures, and using the Small World ride as a social studies lesson on respecting all cultures. Read them the lyrics of the Small World song while in line and talk about what it means to be a "small world." You can easily carry this same lesson into the World Showcase at Epcot.
So that was probably way more info than you ever wanted. Let me finish up with a list of all the attractions I can think of that might be educational so you can get some ideas for exciting lessons for your students. (some of these may be closed, it's been a while since I was homeschooling at Disney World!) I'm including everything in case someone with older students happens to read through this as well - I know your kids may not be tall enough for some of these attractions.
Carousel of Progress (history, social studies)
Wedway People Mover (science - magnets)
Peter Pan (literature, drama if you can see the play beforehand)
Tom Sawyer's Island (literature, PE, probably do some simple machines here too)
Swiss Family Robinson Treehouse (literature - and get the Dole Whip across the street!)
Big Thunder Mountain (physics)
20,000 Leagues Under the Sea (literature - but I think this is now a Little Mermaid thing)
Mad Tea Party (physics - centrifugal force)
Listen to the Land (ecology, biology)
Living Seas (ecology, biology)
Mission: Space (never been on this, but it looks like it would be good for science. I hear there are moments in space exploration history painted on the walls where you wait in line)
Energy Pavilion (Science - energy and dinosaurs)
Innoventions (Science, technology, etc. You can't go in there and not learn something)
Jammitors (Music, rhythm. They can inspire a Stomp-style rhythm band with household items!)
ALL of World Showcase (geography, social studies)
Great American Movie Ride (Art - film)
Tower of Terror (physics - terminal velocity)
Beauty and the Beast (Music/art - this is a mini version of the Broadway show)
The Times Square Set (Art - forced perspective)
Dinosaur! (more dinosaur science!)
Kilimanjaro Safari (ecology, conservation, biology)
Conservation Station (ecology, conservation, biology)
Gorilla Trail (ecology, conservation, biology)
Lion King show (Music/art - this is also a mini version of the Broadway show. Pay special attention to the costumes!)
Petting zoo at Fort Wilderness (science - biology)
Horseback rides at Fort Wilderness (science, sports)
I hope this helps! One of the best things I learned from homeschooling is that every life experience can be a learning experience! Especially Disney World!
Deia
ps - you are doing a wonderful thing by homeschooling your kids. I am forever grateful to my mom for homeschooling me. (tearing up right now) I know it's probably scary and challenging right now, but let me tell you that it's worth it. Just thought you should know.