Hi Alta,
To travel between Disney's Hollywood Studios and Magic Kingdom, you can take a bus from the Studios to the Transportation and Ticket Center (TTC) and then transfer to a monorail or ferry boat to the Magic Kingdom. If you prefer, you can take a bus one of the resorts on the monorail line (Polynesian, Contemporary and Grand Floridian) and then take the monorail to the Magic Kingdom. You could also take a bus to one of the other Disney Resorts and transfer to a bus headed to the Magic Kingdom.
To get from Animal Kingdom to Magic Kingdom, using Disney transportation, you would do basically the same thing. Take a bus to the TTC and transfer to the monorail or ferry boat, or take a bus to a resort and transfer to a monorail or bus to Magic Kingdom.
To get to Epcot from the Studios, you can take a boat from the exit of the Studios. You can also walk (it is about a 25-30 minute walk along Disney's BoardWalk).
For more questions regarding how to travel between parks using Disney's Transportation System, please click
here.
Have a great trip!
Tanya