I'm not sure if there are children or teenagers in your party, but you may decide to slow down the pace of your trip and not try to do one entire park for each day . . . particularly if there is a strong chance of returning in the future. In the past, I would take a young niece and we would "do" every park once during our 6 day stay and then have one day off for downtown disney and one day to return to a favourite park. I usually ended up with a very tired, grumpy young companion because of the amount of rushing and walking involved. In hindsight, I would do what I now do on solo trips . . . I divide the two big parks of Magic Kingdom and Epcot in "half" and then devote one full day to Animal Kingdom, one day for Hollywood Studios and a few days left to return to favourites or take a break at downtown disney or by the pool. With the Magic Kingdom, I divide the park down Main Street and on one day I spend the day on the left side doing Adventureland, Frontierland and Liberty Square and enjoying classics like Jungle Cruise, POC, Haunted Mansion, Big Thunder Mountain, Tom Sawyers' Island/Riverboat, etc. On a different day, I go to the right of Main Street to enjoy the new Fantasyland including fastpass for 7 Dwarfs Mine Train and the classic Tomorrowland attractions. If I have any downtime, I hop on the train or take the monorail to tour the nearby resorts. At Epcot, I try to divide the park in half as well with Future World (at the front of the park) and World Showcase (back of the park). I take one day to focus largely on Future World including the aquarium, science pavilions including the build your own roller coaster Sum of All Thrills, and the handful of headliner rides such as Soarin and Test Track. The Behind the Seeds Tour in the Land Pavilion is also wonderful and a relatively low cost extra add-on. I may sneak into the edge of World Showcase for meals that day. Another day, I don't do rope drop at Epcot, have a later start and head to World Showcase for the day. I may take the boat to the Boardwalk area for a break, enjoy shows like Oh Canada, China, France and the American Experience. I usually schedule my fastpasses for much later in the day and do the Future World rides on my way out of the park that evening. To ratchet down the touring experience like this means either enjoying a longer stay or, within a smaller footprint like your planned vacation, simply highlighting the 2 or 3 parks that your family truly wish to see at this time. When I travel now in the Fall for the Food & Wine Festival, I try to stay for a week and a half to make this style work for me. However, I will be traveling to Disney for a short 5 day stay next month and, as a result, I am not trying to do everything but am focusing on the 3 parks that I most enjoy. Hollywood Studios is off the list this time as it is not a personal fave and with so many attraction closures, there isn't as much to enjoy right now. The 2 water parks are also off the list as they are not must-dos for me and it is the winter season and may well be much chillier. Maybe to get the most bang for your buck, you might want to sit down with your family, figure out what they really want to see, and then "do less" to get more. Good luck and enjoy!
