Thank you for returning to the Disney Parks Moms Panel, Allison! You’ll love the ease of the complimentary transportation around Walt Disney World Resort.
You are correct that the best way to Magic Kingdom from Disney’s Fort Wilderness Resort would be by boat, but as for the other parks, I would recommend the
bus transportation. Buses begin running 45 - 60 minutes before park opening (this includes
Extra Magic Hours) but if you are attempting to be present at Disney’s Animal Kingdom for rope drop in order to access Pandora- the world of Avatar at opening, you may want to consider taking a Lyft or UBER. I have taken this route a few times if I want to be extra early for an attraction or have dining reservations before the buses start running to Resorts and parks.
If I can assist you further with your magical vacation plans, please let me know. It’s a jungle out there, and I’m hEAR to help! ~ Lindsey P.