we took 2 months, but spent a good amount of time in ottawa and winnipeg visiting family. ... i'm really missing winnipeg right now!
i'm a travelling lounger more than a sight-seer, but hanging around south main in vancouver is fun - lots of cafes & vintage shops. commercial drive is interesting, there are lots of botanical gardens worth visiting, plus all the sites jom's mom listed. we lived there for three years, so if you want more specifics i could email you. the sunshine coast is very pretty, but i would kick over to the island and tour here. victoria is really beautiful with so many parks and beaches and farms, up island is fabulous too. again, email me if you'd like more info on things you're interested in. the smaller islands are a rather unique canadian cultural experience, you might just not want to go home! we lived on cortes island before moving to vancouver & it's intoxicatingly gorgeous - full of stars and cougars and warm ocean water.
if you're taking the #3 highway through the kooteneys & your van's engine was anything like ours detour the worst summit via the ferry near nelson!
where are you starting from and when do you leave?