We will be staying at the Dolphin in July 2011, never stayed before, very excited ! We stayed at the Boardwalk 2 years ago. I did the same thing that mikegood2 did, I used Google earth to see the actual walkway to Epcot, so very cool !! The walk to Epcot's International Gateway was so wonderful. We went in July and I get hot (sweat) very easily.
The walk was perfect and I did not sweat or get tired out ! That entrance to World Showcase was obviously less crowded and that made it even better ! Walking by the Boardwalk is nice b/c you pass all the shops and a beautiful (wedding?)pavilion. Walking by the Yacht & Beach Club is nice too,

so you can walk either way and enjoy what each hotel's outside area has to offer. Have fun !!!