I shot you a PM over on CruisersForum as you posted a similar request there. Did you get it? :-).
Importing is usually fairly straightforward, provided you have all of your paperwork in order. You do need the standard paperwork such as bill of sale, and documentation for the people on board.
As the boat is(I believe) built in North America, it would be subject to a PST rate of 12% as the sole tax for the import. It used to be 7% I think, but due to some not very nice political decisions, they increased PST for vehicles to be comparable to full HST then only adjusted it back down for passenger vehicles under a certain value, provided they were purchased after HST was repealed(Boats and planes are excluded entirely regardless of value unless purchased from dealership).
You'll need a receipt for paying this, if you pay customs, or you'll need to cut a cheque for this amount attached to the bill of sale, and a copy of the updated form for Casual Remittance Return (FIN 405, the old one is FIN 315).
Not filing this form won't cause any trouble straight away, but they'll catch up if the boat is registered later.
Link to FIN 405 as a .PDF