The document provides instructions for how to properly wear and use a snorkel mask and snorkel. It explains that the mask should fit securely against the face with no gaps, and hair should be kept away from the face seal. The strap should be tightened just enough to keep the mask in place without being too tight. It also describes how to clear water from the mask by blowing out through the nose. It then discusses using fins to propel through water while keeping them at the surface to avoid damaging coral. General safety rules include swimming with a partner, using sunscreen, and avoiding touching coral. The overall message is to breathe slowly when snorkeling and move slowly to see more wildlife.