Lots of great riding in this area, with classics such as Peaking Ridge, 629, and Involution or venture out into teh backcountry on the 38km Coppermine trail.
For newer riders looking to grow, or people out for shorter rides, Codgers trails have you covered, starting right in the heart of town.
Coppermine gpx file attached (from Trailforks).
Webiste: Nelson MTB Trails
Trail map: Trails Viewer (arcgis.com)
Route type: MTB Park