Don't be blinded by greed and arrogance to what's best for you.
Don't keep sonic social creatures like dolphins and whales in tanks.
Don't remove treasures from other countries without permission.
Don't build dams indiscriminately.
Don't trust military dictators.
Don't trust or underpay your contractors when you build a dam. Or the Boston Big Dig.
Don't forget to look for prehistoric monsters when you run an environmental impact study.
Sometimes those big fish stories are true.
Next time, send the Cousteau Society.
Next time, bring a big frying pan.
The camera adds ten pounds on water monsters, too.
Always have your legs waxed when you're going to be filmed underwater in rubber shorts.
All of the above.