What kind of job should I target?

Hi, I am Chinese and I plan to come back to China from Canada where I have struggled a lot in some areas (not English). The problem is fundamental so there's no doubt I will leave this country but the thing is what kind of job suits me in China. I prefer a job which has more free time, fits my background, international +environmental engineering/nature/environment, not typical 9-9-6 office work, because I prefer field work +office work or more free time work so it may be challenging to find such a job in China. In addition, if they care less about my age 30+ and marital status (single), that's great. I am also thinking about the city I will relocate to. I prefer an open minded, international, low cost city. But I know I am a bit demanding cuz such a city may not exist. I am a girl, if that matters.

Thank you!