You don’t have to plan from scratch. These rides pass close to Aldergrove, 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, passing about 4 km away
Van to Can Day 1— Elbow Valley Cycle Club · 116 km ride, passing about 5 km away
Getting there with a bike: province-wide buses, ferries, and shuttles are listed under Transport (some serving Aldergrove may be listed there rather than here).