Leigh McAdam recommends:
Berg Lake
Elfin Lakes, Garibaldi Provincial Park
Elk Lakes – Petain Basin
Eva Lake, Mount Revelstoke Nationwide Park
Frosty Mountain, Manning Provincial Park
Garibaldi Lake, Garibaldi Provincial Park
Gwillim Lakes, Valhalla Provincial Park
Howe Sound Crest Path close to Vancouver
Hermit Path, (Canadian) Glacier Nationwide Park
Iceline Path – Yoho Valley Loop
Juan de Fuca Marine Path
Kaslo Lake or Kokanee Glacier Cabin, Kokanee Glacier Park
Mount Assiniboine
Nootka Island Path
North Coast Path
Rainbow Vary Path, Tweedsmuir Provincial Park
Rockwall Path
Sunshine Coast Path
Takkakaw Falls – Laughing Falls – Twin Falls – Whaleback Ridge Loop
West Coast TrailDetails from Leigh Adams on Hike Bike Journey – 21 Backpacking Journeys in BC That Will Blow You Away
Having finished most of these adventures myself, of that checklist I’d first suggest:
West Coast Path
Mount Assiniboine