There's a number of ways you could go but your going to add considerable time to your trip. The first half of 528(up to exit 4) doesn't have tolls aim to get there then go down I4 any other way depending on the time of day would be considerably longer.
Here is the toll free route from the landside terminal:
-from south exit take Boggy Creek Rd South
-u turn at J Lawson Blvd
-left on E Weatherbee Rd
-right on S OBT
-left on Central Florida Pkwy
-slight left on I-4 W, keeping left upon entry and taking exit 67 to Epcot Center Dr (535)
-right on N World Dr towards Magic Kingdom
-exit left towards Disney’s Polynesian Village Resort
-right on Floridian Way
-Disney’s Grand Floridian Resort & Spa will be on your right!