Chowhounder from LA, very serious about his Chinese food, is spending the weekend in Vancouver. Can I please get recommendations on where to find the best,most authentic Chinese food. I'd like to find a dimsum place, a Shanghai food place, and one seafood/Cantonese place. Downtown would be best. We're staying at the Hyatt. I've lived in China, and so really prize those places that are closest to the best in HK and China. Thanks.