Note that OP is about Chinese tourists.

Note trashing of the seas and serious reduction of many fish populations - tuna in the Med, for instance, much of which seems to go to Japan.

No opinion on tiger's post, but note that Wenlinjie and Green Lake are very close to each other.

Plenty of people in Kunming manage to get to their apartments, even those as high as the 7th floor - few older apartment buildings have more than that - without an elevator. Healthy and doesn't waste power. Doubt if you'll want to move more than once (out of a hotel and into an apartment) in a single summer.
Dazzer: All of the places you've mentioned, plus Beichen and others. Also obviously depends on who you want to meet. Personally, I like the Green Lake area, partly because it's near many universities, but I like it even when they're closed, in spite of the fact that it's not exactly the whole town.

Issue of killing is all over the map too - I don't consider the killing of a fish or a chicken the same as killing a pig or a cow - but then how much killing is necessary to feed, say, 10 people on chicken?
Issue of effect on environment of raising different animals also very variable - pigs can eat a lot of waste, for example, and sheep & goats can live off land that many other food animals can't live on - although it's also the case that they have contributed to events like, um, the growth of the Sahara Desert.
All complicated, but not totally beyond understanding, especially for those with scientific etc. credentials & experience.