Dh and I lived in Vancouver for 2 years, and really loved it there. It fits many of the requirements you listed: outdoorsy, optimistic, clean. I worked in schools and I think it's a great place for children. The education system is good.
I think most Canadians would be pretty offended to hear that you worry about the lack of 'intellectual debate' in vancouver. There is no shortage of people willing to debate global issues as well as nuanced local ones.
As for culture, it depends what you mean. Vancouver doesn't have as much 'high culture' - ballet, opera, theatre etc as somewhere like london, but it does have a soul, and a cultural life, and a good amount of native Canadian (first nations) culture to explore.
Lastly, I'm not sure what you mean by bicultural (which cultures? - you don't have to say, but it would help me give you advice), but I don't think people would think that remarkable in Vancouver. It is a majority white city, but it has a large immigrant population, international student population, and is a forward-thinking, multicultural city in many ways. Most vancouverites are well traveled and there are significant Persian, Sikh, and Saudi communities as well as the well known large Chinese and Korean communities.
You do sometimes hear people complain about Vancouver and talk about the good old days, before all the condos were built, before it got so expensive... but that is the same many places, and most Vancouverites are still fiercely proud of their city, loyal, and very Canadian in their ways.
Have you been there? Would you hope to live downtown or elsewhere?
Happy to help any way I can. I loved living there and would move back in a heartbeat if circumstances were different.