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) Visit the biggest lake of China - Qinghai Lake
2) Visit the “the Mirror of Sky in China” - Chaka Lake
3) The unique and spectacular aquatic Yadan in the world - Wusute Yadan Geopark