I can't speak toward the requirements for NAUI, I teach PADI. The skin dive is optional during PADI's open water. You may want to check with your instructor and find out if its required or optional. When I did use it I have my divers touch the platform, if the breathing is done right you can even look around and tell people what's on the platform. You'll be able to hold a good breath for some time. Don't worry skin diving is easy.
