The Stanley Park Seawall. I try to complete the six-mile walk around the Stanley Park Seawall at least once every time I'm in Vancouver, not just to work off all the good meals I've been eating, but primarily because it is one of the most enjoyable urban walks around.
Clear days offer vistas of snow-capped mountains and scores of seabirds.
If you enjoy public markets, there are two close to downtown Vancouver, and each is different enough to make visiting both worthwhile. Nighttime brings a whole new and exciting set of offerings. There is usually a Broadway show in town, as well as an interesting array of local theater productions and musical events. A huge array of summertime festivals enlivens the city's long summer evenings. The sea wall runs all the way around the perimeter of the park.