I would have thought the walk to the Swan was too much myself, but when we stayed my wife convinced me go for it after park closing. (I'm not much of a walker, especially after doing the parks.) It was really pleasant though, mostly because of the fact that you feel like you are still in the parks when you walk past the Boardwalk with all that activity.
That being said, it is a moderately long walk, but you dont have to walk it, the boats are excellent and carry a large amount of people, even at park closing you will usually get on the second boat without a bad wait. If you don't want to walk, take the boat.
Also, I have done Epcot coming from the Poly and will do it again when we stay at the Floridian in Oct. I dont really consider it that convenient. Switching monorails at the TTC is not exactly a piece of cake, they make you walk all the way down and back up the other platform to get to the Epcot monorail, which can somtimes be very crowded with day guests. Then while the ride in is ultra cool because it loops around Spaceship Earth and Future World, it drops you off all the way out front. Considering that Future World closes early and we will be going for the 7-9 window that the World Showcase is still open, you are talking about a major hike thru Future World, across the bridge to Mexico or Canada.
When you come in through the International Gateway (the Swan/Dolphin/Beach&Yacht/Boardwalk entrance) you enter right between the United Kingdom and France. We were there every night and as much as I am looking forward to the Floridian I will miss that kind of convenience.
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Jun 72 offsite
Apr 89 offsite
Mar 95 All-Star Sports
Nov 95 offsite
Aug 96 Boardwalk Inn
Dec 96 Port Orleans French Quarter
Sep 98 Beach Club
May 99 Port Orleans French Quarter
Jan 00 Polynesian
May 01 Swan
Oct 02 Grand Floridian