of the snorkel, attach it much higher than you usually do, about to 1.5 to 2 inches from the top. now attach the snorkel keeper in the back or center of the mask strap as opposed to the side of the mask strap. (see photo number 3). using this method, the snorkel will be sitting on top of your head when you are face down. this lifts the snorkel an inch or two higher out of the water than the traditional method. see photo number 4.
this slight change in setup will absolutely reduce the amount of water you get in your snorkel, which will benefit any diver, regardless of experience. 