Dear Wen Jie,
Thanks for contacting Top China Travel!
Accodingly to your schedule (arrival at 2:30 pm and leave at 3:00 pm), there is only half an hour only, it is not enough to pay a visit to Heavenly Lake.
Heavenly Lake tour from Urumqi will take a whole day. The lake is about 120km from downtown Urumqi. The beautiful lake is flanked by rugged pines and cypresses, with clear melting waters reflecting the surrounding of snow capped mount Bogeda. Heavenly Lake is located half way up Bogda Peak in Fukang County, 110km east of Urumqi City.
If you have a whole day, you will be able to take the tour.
Any further request or question, please feel free to contact with us.