Hello Katastrofa
Hopefully others will chime in soon. The Vancouver lower mainland was my patch for many years but unfortunately I'm less familiar with Vancouver Island so will refrain from commenting on that.
You say you are looking for companions so you might try Birding Pals
http://birdingpal.org/britishc.htm as there is a long list of “pals” in the lower mainland as well as a goodly part of Vancouver island. I've had some moderate success with it but you do take your chances with the personalities. You could also contact the Vancouver Audubon Society as perhaps one of their members may want to jump on your offer or at least make a few suggestions.
You don't say in your post whether you know the Vancouver area or not but for now I will assume you don't. If you do know the area well please forgive the presumption and feel free to ignore the following blather.
Here's a short partial list of some of my favourite spots in the Vancouver lower mainland.
Riefel bird sanctuary.
The raptor, wading and waterfowl birding can be gratifying there to say the least. Crisp clear and cold days seems to be good for seeing plenty of all three. In one short morning alone I saw 5 hawk species, 3 falcon species and 4 owl species to say nothing of the Bald Eagles and the two dozen or so water fowl species. The huge Snow Geese flocks have been known to put on a pretty good show. Sandhill Cranes winter there and can be disconcertingly tame.
Cypress mountain trails
Located in West Vancouver and is pretty good for Sapsuckers, Grey and Stellars Jays, Pine Grosbeaks, Crossbills, Ravens, Golden Eagles, and the Blue Grouse which I think now have a brand new name.
Queen Elizebeth Park
Plenty of wintering over Passerines, Annas Hummingbirds, Owls and small raptors. For a mostly manicured park it still can be very productive especially the day after a storm.
Jericho Park.
Been a while but when I was a regular it was one of the few central city parks that wasn't manicured. The park manager wished it to remain in its original state. So lots of passerines in the underbrush and meadows as well as a couple of ponds for wintering waterfowl and their attendant raptors.
Maplewood Flats
North Vancouver, shorebirds, waders, waterfowl raptors and Passerines, no dogs allowed past the bridge, good for the birds. Still doesn't stop dog owners getting sniffy about it being the generally entitled group they are.
Colony Farm
Couquitlum, seems to have come into being by managing to stay a farm in the middle of a development and is happily now a reserve. Great place, lots of Passerines and raptors.
Of course there are many more but these a few to be getting on with. One suggestion I would make if I may is try to avoid any of these places on the weekends. Vancouverites are reasonably outdoorsy and they can get busy at those times. Weekdays are best and you can often find you have almost the whole place to yourself.
I always enjoyed winter birding in Vancouver and do miss it.
So there you go, some free advice ;-) Thanks for the chance to go down memory lane.
Cheers,
Bryan