There are several good ones near downtown: Looit is near Esther Short park. Trusty brewing is a couple of blocks away, as is Mt. Tabor. Trap Door is several blocks up Main St from downtown. Railside is a bit north in Hazel Dell (Hazel Dell Ave. and 74th) less than a mile from my house. I haven't had any of their food offerings, but the beer is good.
If you put your trip off a week you'd be here for the Vancouver Beerfest.