No need to scroll through the whole thread, everything you need to know is on page #1. This is from post #13.
"Secret" Entrances/Exits to the Beach Club and Yacht Club
Step-Saving Super Secret Entrance to the Beach Club
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.
This was really handy for us a couple of times this summer when it was wicked hot and when it had just started pouring.
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.
Here are photos of the exit door near room 1501, the pathway and the gate to the "secret entrance"
Yacht Club Secret Entrance/Exit
Facing the Yacht Club, the marina will be on your left and the wedding gazebo to your right.
This is the room closest to the entrance to help you find the exit from inside.
According to the small sign you can see in the picture, this door has keyed entry during the hours of 11 PM to 7 AM