We rent bikes every year when we go to Vancouver on our sailboat, pre Covid. We use Spokes Bicycle on W. Georgia. You can walk along the waterfront from the cruise port. We ride through Stanley Park, English Bay, and False Creek. You can stop on Granville Island for lunch, snacks, crafts. Then you take the little passenger ferries back to mainland. It is flat all of the way. There are good signs along the bike paths. I would not ride downtown, there are too many cars, no bike lanes. Look at street map of Vancouver to gauge route based on ability of bikers. You can also walk and take passenger ferries to Granville Island. We used the bike rate for 3-4 hours if I remember, last time in 2018.