Ohboy ohboy!! Van has some of the best restaurants on the planet!
The reason you haven't had any replies is because you should post in the
Canada forum.
I have some suggestions. Van isn't inexpensive, as you may know. So you might consider a B&B in west Van -- lovely atmosphere, usually a house that's a century or more old, and hosts who are gracious, smart and interesting. That's been my experience.
This link is to the best collection of travel advice -- real travelers reporting their real impressions. TripAdvisor dot com. This will open to the Vancouver B.C. overview page, with everything you'll need in the left column:
Vancouver Tourism - Vancouver Vacation Reviews - Vancouver Vacations - TripAdvisor
and the accommodations page:
Vancouver Hotels: Read Vancouver Hotel Reviews and Compare Prices - TripAdvisor
I strongly recommend staying in west Vancouver. It's pretty, gentle, convenient to just about everything that you'll be interested in. Be sure to Google for Vancouver BC tourism to gather info.
Don't rent a car -- you won't be able to park anyway as the city ordinances about parking are extremely strict. The public bus system is wonderful, and takes you most everywhere. The Yellow Cab/Black Top (one company) will come and pick you up anywhere and take you anywhere; not inexpensive, but clean, comfortable, and the drivers are polite and know everything about where they're going (like London cabbies).
For weather, check Weather.com. It's cool and possibly drizzly, possibly sunny, possibly cloudy, possibly rainy, probably all of the above. I live in Seattle -- Pacific maritime weather is unpredictable. You won't need special rain footwear, so just pack a foldable umbrella and whatever you want for "cool" weather.
If you love authentic Japanese food, I strongly recommend my own two favorite Japanese restaurants: Toshi's, and Aki. Perfect Japanese food.
Have a wonderful adventure in Vancouver!