I did a trip in a 185 on floats coming east from Smithers Bc to Nakina Ont. in 07, went from Smithers-Fort St John (had 40 gal. Of avgas with me in cans to fill up at the local dock at Charlie Lake, as avgas on floats was hard to get in Alberta in mid Oct., then on to Voyage Air in Buffallo Narrows(bring cash), then to Flin Flon(wings over kississing), then to Red Lake(Green Airways), then to Nakina (Leuenberger Air). Past Nakina you can stop in Wawa, North Bay, Chapleau, Cochrane, Temagami. This trip was going east but should work going west also. As cub12 said it probably won't be early May.