Yes, it is very safe to visit Xinjiang now. The Uyghur people are some of the most friendly you’ll ever meet. Most visitors feel it is totally safe in the main tourist areas, though there may be an elevated police presence.
1) Discover the UNESCO World Heritage Site - Terracotta Warriors
2) Enjoy a leisure biking on the Ancient City Wall
3) Visit the over 1300 years old Giant Wild Goose Pagoda
4) Find the local special snacks in the lively Muslim Quarter