What are the specific preparations for traveling to Yunnan for sun protection?

When you go to Yunnan, you will definitely go to Shangri-La, where the altitude is high and the ultraviolet rays are strong. You should bring sunscreen with high SPF, preferably long-sleeved trousers. The temperature there is not high, so it won't be cold to wear long-sleeved trousers, and then you can bring a hat or parasol. The last time I went was in August. I put on my coat just after I warmed my long-sleeved trousers. However, we should pay attention to the acclimatization (after all, it is still at a certain altitude in Yunnan-Guizhou Plateau), and go to the hospital to get some injections and buy some medicine to prepare (I had a fever the next day last time, so I didn't have a good time).