Don't walk or stand on coral. This can kill the living polyps that build the reef structure. Tie up at mooring pins or anchor only in sand away from living reef.
Anchors damage the reefs.
Do not attempt to touch or break off pieces of coral. Taking live coral or rock with attached marine life is illegal in Hawai'i. Please don't feed the fish. This upsets the natural balance of the reef and encourages the proliferation of more aggressive species. Don't touch, pick up or hold reef inhabitants.