Bus,boat or walk.Buses can be accessed from the front of each park.Boat will go from the front of DHS to the International Gateway of Epcot in the World Showcase,boats are not fast but are a nice way to go from park to park.You can also walk from the front of DHS to the International Gateway,it's not a short walk 20-30 minutes depending on your speed,you will walk along the lake outside DHS then go under the Buena Vista dr overpass,you will see the Boardwalk villas soon after,cut through the Luna park pool,go through the hallway with the bathrooms and arcade which leads to the Boardwalk plaza,doing this saves you from walking around the whole Boardwalk,get on the Boardwalk and go towards the ESPN Club then just continue and after the bridge turn right.Never walk if it's too hot as the walk will wear you out.