How about a VIA Rail pass for, say, Montreal to Senneterre? I haven't (yet) had the opportunity to ride the Canadian rail system, but it looks like there would be good photography along the way.
OMG, that would be really... how can I say... an adventure.
That would mean traveling for 13 hours in their old bone-shaking trains on one day and doing the same for the return.
The route is mostly through forests with not much more than spruce trees on each sides.
It's also a good idea to avoid black fly season...
If you want to know how Via is, take Southern Rail and make it less reliable