This thread is confusing because people are discussing two different things that save steps. The Yacht & Beach Club Thread over on the regular (not DVC) Disney Resorts forum talks about both of them.
Item # 1: The Beach Club Secret Exit
This is a doorway which takes you from the outdoors into the Beach Club building, or vice versa. The thread says this:
There is a side entrance/exit to the Beach Club which takes you mere steps, probably 3 minutes, from the International Gateway Entrance. It is near room 1501. [When you are inside the Beach Club] You have to go through a lot of hallways to find it, so the best way to do this is to follow the signs to room 1501 from the lobby.
There are photos from both inside the building and outside the building here:
https://www.disboards.com/threads/d...-information-questions.3400342/#post-53451148
Item # 2: The shortcut path from BCV to the walkway around Crescent Lake
If you are staying in BCV and you want to go to Epcot, you do not have to go into the Beach Club resort to get there.
When you leave BCV, head toward the Beach Club, but look for the path between the green building (Beach Club Villas) and the blue building (Beach Club Resort). Walk down the path until you get to the point where you can't walk straight anymore, because you would walk into the bushes. Turn RIGHT. This is tricky. Your instincts will tell you to turn left, because you know that Epcot is to the left. After you turn right, go all the way to the end, and then turn left again. This also is tricky. The path will be so close to the patios of the first floor rooms that you will think you made a mistake and went the wrong way. You didn't. Follow that path until you reach the gate. The gate will let you out on the main path which goes around Crescent Lake. Stop and look at where you are, so that you will be able to find the gate on your way back in. Then turn left to get to Epcot. I suggest doing it in daylight the first time.
There is a photo of the first turn here:
https://www.disboards.com/threads/d...-information-questions.3400342/#post-53451110