Located about three hours from Vancouver via the circuitous Trans-Canada Highway, there are plenty of worthwhile ridges and some lengthy, backpacker-style hikes in both the upper and lower valleys, where you can put to use any of the eleven accommodated camp sites on a journey to the middle of nowhere. The views over both Stein and Tundra Lakes are a stellar reward for the 60 km or so it takes to get there, with backdrops of alpine forest and mountain peaks lifted straight from prehistory. If you're a true adventurer, head to the official site and see what you could be doing in the Stein Valley, which (naturally) means "hidden place" in the language of the aboriginal First Nation tribe.
Note:Take any and all safety precautions when tramping this far into the wilderness; bring potable water or water filtration, good footwear, and take measures to avoid the grizzly population. Also, be sure to have a good map, because vehicles aren't allowed in the park and it is sporadically patrolled by rangers.