I’ve had a quick look at all the Canvec/OSM map features. Looking for permanent or potentially still valid items, I propose to keep only the following for import:
Hydrography
natural=water
waterway=stream
waterway=riverbank (need to be converted as natural=water + water=river)
Wetland
natural=wetland
Place
place=*
natural=peak
Transportation
highway=*
Any comments? Any other suggestions?