Since Walt Disney World is twice the size of Manhattan there really is no one source of transportation that will take you on a tour of the entire resort.
The monorail has two lines. One goes to the Magic Kingdom and has a local run that stops at the Contemporary (goes through the building), the Polynesian, and the Grand Floridian resorts. The other run to the MK is from the Transportation and Ticket Center. This is where all vehicles to the MK must park. From there guests have to either tram or walk to the boat or monorail over to the Magic Kingdom.
The second monorail line runs form the TTC to Epcot. This is a longer run and gives you a nice look at Future World before it stops at the Epcot station.
The other parks can only be accessed via Disney buses or cars. You can travel between Epcot and the Disney/MGM Studios by boat. The Friendship boats travel between the two parks throughout the day. They stop along the route at the Yacht/Beach Clubs, Boardwalk, and Swan/Dolphin. From Epcot you need to exit at the International Gateway, which is near the United Kingdom to get the boat. You do not have to enter the Disney Studios to get the boat from there.
I suggest you go over to allearsnet.com for tons of information on WDW.
