Greater Vancouver Zoo is in Aldergrove, well east of Vancouver proper, and is one of Langley's main visitor attractions. The grounds are large and spread out, with animal areas, walking paths, education programs, and enough space that the visit feels more like a half-day outing than a quick exhibit loop.
It is most useful for families travelling through the Fraser Valley or staying in Langley. As with any zoo, the value of the visit depends on your comfort with captive wildlife, but it is a durable, well-known regional attraction rather than a minor roadside stop.