The whole trip can be done in about 3 days if you want to be quick about it, best is to clear the locks and as a Canadian you just
cruise through, no problems minimum ID is birth Cert with picture ID (Gov Issued) of some sort. Once you clear the last lock, that's where the adventure begins, we spent 14 days in the 1000 Islands last summer and found we only saw a small portion, with so much to see and do along the way you really could do a month and still miss some of the
events.
Have a great time and enjoy the view, its spectacular