As noted above, you need to walk to the Beach Club for Cape May. Its actually slightly closer than BW. Just exit Epcot at the International Gateway, walk up the hill and go straight (rather than turning left) to get to the Beach Club.
Oh, and I'm sure somebody will mention the boat. If you decide to take the boat, it first stops at BW and then crosses over to Yacht Club, from where you would then still have to walk over to BC. That would probably take 30 minutes.