The PADI Underwater Naturalist Course - Look closer to see more on your next dive. Look for symbioses, predator/prey and other relationships between aquatic plant and animal life. Learn not just what fish and animals are, but how they interact with each other and the environment.
Coral Reef Conservation - As a scuba diver, the health of aquatic ecosystems is often what makes a good dive. Become aware of the fragileness of coral reefs and how you can help preserve them.