Sayram Lake National Park
The lake is far from Urumqi, close to Kazakchstan borders. Around the lake live just some Kazakchs with sheeps and horses. Enterances and few hotels are under construction, but only on one place. That means you can camp where ever, spend some time here and than continue to Kazakchstan or go back to "China".
Flora and fauna
Fairly cold year-round but much nicer from June to September when local families are on site and not spending the low season in Yili Town, making it difficult to find a place to spend the night.
Hitchhike. Buses from Urumqi to Yili, get off at lake.
Enjoy holidays on the beach of always cold but clean Sayram lake and wonderful surrounding, herd sheeps with locals, learn from them how to survive. Do trip to Yining also Yili Town (about 150km) or another city around. Visit local "shop" and ride horse around.
Share with locals what do you have, they will share everything with you as well.
Camp or stay in the tent of locals.