One of the classic marks of the culture is the totem pole. These were on Stanley Island in Vancouver.
One place we can definitely recommned visiting is MOA, or the Museum of Anthropology in Vancouver. It doesn't just cover the local tribes, but the whole of Pacific coast and has some stunning exhibits.
After Vancouver we visited an island well to the north called Haida Gwaii. This is a very rarely visited place, even by Vancouverians?) and is even more steered in local culture. We stayed in a hotel run by the local Haida people and had a local guide, Ai-Ai, showing us around.
Again, there was a very good museum of local culture which both showed and explained the local arts and cultures.
One of the most interesting things was meeting Jim Hart, a local Haida chief and carver who is raising full sized totem pole and transferring it eventually to Vancouver. He was a real character, like a moderne hippy, carving this giant tree all by hand, with his assistants.