What should I pay attention to when I go to Ruili, Tengchong and mangshi in February?

I went to Ruili and mangshi in early February. Suggestion: Umbrella and sunscreen. It's always hot in the morning. Money, when you get to Ruili, you will find that jade is really cheap ~ Tip: There is no bus in Ruili, so you can only take a taxi there. Let the driver hit the meter, or I'll blackmail you. Tengchong bait and volcano, you know ~ ~ Anyway, it gives me the feeling that it is very hot ~ ~ ~ with strong radiation. Although the altitude is not as high as Kunming. When I went back to Kunming from there, my friends said I was black ~ ~ ~