I don't know about the ASEAN Forest, but have heard good things about access to hiking in the hills in Chenggong.
You could also consider the area in Kunming proper that is north-northwest of Xiao Tun and Huangtupo. Good access the roads that run west out of the city. Quite a bit of nice forest, trails, little villages, etc. out that way. They are building a subway line that should be open within the year and will terminate at somewhere around, I think the English name is Joy City, 吾悦广场. It's closer to the core parts of the city, like Green Lake, downtown, Dianchi Lu, Beishiqu etc.
Also, the northern part of Kunming, like out toward the end of Longquan Lu has some decent countryside access.
If you don't have any luck in north, there is an electronics mall and a gazillion street level repair shops on Yuantong Bei Lu between 121 Street and Yuanxi Lu. Should be able to track down whatever you need quite quickly.
I've been taking boxing classes with Kasey, who is an excellent teacher. The studio is no-frills, but they have a wide range of yoga, self defense and other classes. And some of the teachers even donate the class fees to charity. Glad to have Spring City Yoga Collective as part of the community in Kunming.
Stopped in today while out on a motorbike ride. Nice place to chill out away from the hustle and bustle of town. Can swim in the reservoir nearby (although technically prohibited, nobody seems to care). Great pizza. Good coffee. Reasonable price. As previous reviewer mentioned, if you're going there particularly, it might be worth calling and double checking they're open and arranging for food. Owners speak English.
A welcome addition to the Western choices in Kunming! Good bread, world-class pastry art, a small but solid food menu. Would suggest a little more flavor in the tomato pasta, and eggs benedict would be even better if on an English muffin instead of bread.
A nice day out. I missed the second exhibition. The third exhibition, currently ongoing, is contemporary photos of the Kunming-Haiphong railway, mostly the Chinese side. I thought it was quite good. It's not a huge space, but the 1903 commercial complex has some decent dining options (including the museum cafe itself which has some expensive but very good single origin coffees).