The best thing for the environment
is when there are no cruisers/sailors.
I think the best way you can implement your academic knowledge in your job is when you show people the damage we are doing and show them how we CAN minimize this damage.
Ecology tours are a fine idea (perhaps as long as they are done with full respect to the environment
in the first place - no sewage/grey water
dumped, minimum use of the engine
, etc..) and you may too like to explore the possibilities in the media / social networks too - e.g. by making eco-podcasts, eco-journalism, etc.. and publishing well produced ecology information on the web (your fb, yt, twitter media can be in turn used to drive clients to the company you are working for).
I think it is important to talk to the young generation - they have their habits only half-formed by now, they are idealistic, they have time to go sailing, etc.. You may be able to design a sailing-ecology course for young people. And by doing things with the young generation you may in turn be able to watch how they interact with the world (and how they spend their money
...). I think this may later be used to develop effective strategies and target your companie's services in the right way, to the right client.