If you're driving your car, park at the MK lot (at the TTC) and take the monorail to Epcot. To get to MK, take the Monorail from Epcot to the TTC. Switch to the Express Monorail to MK.
One time we went to Epcot, over to MK for MSEP and Wishes, then back to Epcot for EMH. Park Hoppers can be used in many ways. Especially at Epcot -- you could easily go over to DHS while you're there. We went to DHS just for Fantasmic one time.