1 - Try to get as streamline as possible by using retractors to keep your equipment close to you and not dragging on the reef.
2 - When close to the reef or bottom keep your fins up and use shallow kicks to prevent stirring up the sand or silt.
3 - When taking pictures use your breathing as your buoyancy and remain very still.
4 - When packing for a dive trip don't forget a surge protector strip for recharging your batteries.
5 - Bring a dry box on the boat with extra batteries, film, and a dry towel for in between dives.
6 - Wear a hat or a visor when changing film or batteries in between dives to prevent dripping in your camera.
7 - Always pack a spare mask in your dive bag. You don't want to miss a dive because your mask is damaged.