You don’t have to plan from scratch. These rides run through Greenwood or pass close by, mapped and written up by route publishers around BC. The full maps and turn-by-turns live on their sites.
BC Gravel (BC Only)— Elbow Valley Cycle Club · 1,300 km route, 3 km of it through Greenwood
BT700 Castlegar— BT 700 Bikepacking · 304 km route, 3 km of it through Greenwood
Getting there with a bike: province-wide buses, ferries, and shuttles are listed under Transport (some serving Greenwood may be listed there rather than here).