I'm teaching a seminar today. Normally I'd direct attendees to resources hosted on our students' site: www.internshipprogram.ca . Unfortunately there's another permissions problem on that server we're sorting out, so in the meantime, they need job search links. Those are posted for them below:
http://www.Go2hr.ca - this site has an excellent jobs board for hotel and resort jobs around BC.
http://vancouver.craigslist.ca - this is hugely popular in Western Canada and the US. Free job ads - so everyone posts here.
http://kijiji.ca - be sure to select your city at the top right of the page. This is a spamy version of Craigslist, you can still find good things here though.
http://www.jobbank.gc.ca - this is a government-run site for advertising jobs. It's a pain to post a job with them, very bureaucratic, so there aren't many jobs here, but some, worth looking for sure.
As for the other sites? Working.com, Workopolis, Monster - I've never met a person who's found a job on there. I've never even heard of a person, who's found a job there. Just skip them, total waste of time.