Maybe it isn't my place to comment (but I will ;D), but I think that "being close to the ocean" isn't what I would consider to be a prime factor in choosing a career in the CF (the old song "I joined the Navy to see the world, and what did I see? the sea, the sea, the sea...." springs to mind). I know that most people usually want to join a trade that gives them a chance to be close to where they grew up, usually for family, or to be close to their friends. Having said that, I'm from BC, and the closest I got posted to BC was Edmonton (I'm Armour Corps, so that's the furthest "normal" posting West there is). I've spent 10 of my 17 years out East (2 in Petawawa and 8 in Gagetown), and although I'd prefer to be out West, "home is where the Army sends you.....".
I find that people are too hung up on being in one place for too long, and for the wrong reasons. It's nice to be comfy and cosy, and grow roots, but that is what retirement is for. People tend to get it in their head that the CF is there to cater to their whims (damn QWL (Quality of Working Life) or whatever the policy is called), and if they are told to pack up and move on, the excuses for not going are fast and furious. I can't speak for officers, but it has been my experience that they move around the most, with WO's (and higher) being on the move almost the same amount.
BTW, when I first joined I asked to go to the Strathcona's, when they were in Calgary, but I ended up in Petawawa, because that is where the need was. That's something that needs to be in the back of your mind when you sign up. Moral of the story: choose a trade that you will enjoy doing, perhaps in a place (or places) that you don't like, rather that hating the job you are doing, in a location that is suitable to your personal preference. Odds are, the reasons that you want to be there, won't be important a few years down the road (friends move on and away, and a plane ticket isn't really that expensive (plus, you are eligible for the LTA (Leave Travel Assistance) once a year.... if you are single, you can travel to your next of kin, and if you are married and away from your family, you can go to them, or them to you.... it's not 100% paid for, but if you drive, it's pretty much 100%, unless you have a Dodge RAM V12 or HUMMER, and if you can get a seat sale, it's pretty decent..... I may be talking out of my ass, as I haven't taken LTA (other than overseas) in 8 years, so if it's changed that much, someone please correct me....)
Anyway, hope that helps (or rains on your parade..... sorry....)
Al