On one-side of the lake is Yacht & Beach Club. On the other side of the lake is the Boardwalk Inn and Boardwalk Villas. On one end of the lake you are headed toward Epcot -- on the other end you are at the Swan and Dolphin.
At the Boardwalk Resort -- the Boarwalk Inn is the area painted in white closest to Epcot. The Boarwalk Villas are primarily red and are closer to MGM/the Swan.
Ooops -- just saw that you knew where the Boardwalk was located. Red for Villas/White for Inn should help you visualize. The ESPN Club is on the Inn side -- the store is on the Villa side.