May I suggest you look into obtaining your Limited Masters certification from Transport Canada for vessels less than 60 tons?
http://www.tc.gc.ca/eng/marinesafety/tp-tp2293-chapter12-819.htmIt's not terribly expensive, difficult or time consuming, and what you learn could definitely save lives. I have mine, I highly recommend it. Also, get your Marine Radio operator's certification as well, you will need it.
I was going to start a water taxi service but found the insurance costs too prohibitive. I would love to work on the water too, I often scan the Craigslist jobs list to see what is out there. Unfortunately opportunities are relatively few and far between, and from what I perceive, you start on the dock fuelling up, cleaning fish, etc. and work your way into a deckhand position unless you have actual guiding experience. Pay is low. But hey, you will be a business bigshot soon enough, just draft a decent business plan for yourself and run your own boat. Go for it! I am a diesel engine / commercial transport mechanic by trade, but i would be more than happy to do give life on the sea another run once the kids are a bit older. In the meantime I am working graveyard shift and my only sea access is Beachcombers re-runs on APTN. Still not sure if I am more like Relic or Nick.... maybe a bit of both?
Good luck, live the dream!