You can go from Whitefish to Cranbrook, BC
head north to Golden, and head over to Banff.
Fantastic bridge to cross, and the highways are good.
If you go to Calgary and then over to Banff,
through to Lake Louise, north to the Columbia Icefields,
Jasper Park, back down the Yellowhead (#5),
stop at Clearwater, see the waterfall in Wells Gray,
you will have lots of memories.
The waterfall is four times taller than Niagra Falls, and
the road is good. I would suggest staying in Clearwater
and driving your toad. Lots to see.