Just take a bus to Epcot, and then walk to World Showcase. Cape May is at the Beach Club which is across from Boardwalk, and attached to Epcot through the back of World Showcase - International Gateway. Basically, you'll enter Epcot, and then walk to World Showcase and exit the park through the International Gateway. The International Gateway is right after England, and before the bridge that gets you to France.
I would make the ADR for after Epcot's opening of 9:00 am, and then you should have no worries of walking through the park to Beach Club. They serve breakfast until 11:00, but when it's slow, like 2 weeks ago, we got a walk-up @ 11:20 as they had tons of fresh food left over (we had to cancel as we slept in, but then got the ressie back 2 hours later!)
It's a great buffet for characters, service and atmosphere. It's never crowded, and the food is pretty good.
Enjoy! Tiger