Leigh McAdam recommends:
Berg Lake
Elfin Lakes, Garibaldi Provincial Park
Elk Lakes – Petain Basin
Eva Lake, Mount Revelstoke National Park
Frosty Mountain, Manning Provincial Park
Garibaldi Lake, Garibaldi Provincial Park
Gwillim Lakes, Valhalla Provincial Park
Howe Sound Crest Trail near Vancouver
Hermit Trail, (Canadian) Glacier National Park
Iceline Trail – Yoho Valley Loop
Kaslo Lake or Kokanee Glacier Cabin, Kokanee Glacier Park
Nootka Island Trail
North Coast Trail
Rainbow Range Trail, Tweedsmuir Provincial Park
Rockwall Trail
Takkakaw Falls – Laughing Falls – Twin Falls – Whaleback Ridge Loop
West Coast Trail
Details from Leigh Adams on Hike Bike Travel – 21 Backpacking Trips in BC That Will Blow You Away
Having done most of those adventures myself, of that list I’d first recommend:
besthike.com 