Disagree on Fish ID. You've obviously never encountered a fish geek (like my wife). I swim around and see lots of fish; she swims around and comes out saying there are three new fish she's never seen before, five mating rituals going on, a strange absence of brown chromis, and larger-than-usual grouper. Her appreciation of the environment is greatly enhanced by her fish knowledge, and that is what she communicates in the Fish ID class she teaches and its follow-on,
REEF.org membership and citizen-science surveys, of which there are now over 210,000!