Travelers beware- the main tourist spots in Bolivia are very high altitude. I was visiting from Bogotá (9k feet) and still felt weary.
I visited for several days in April. This wasn’t a crazy long trip from Bogotá and was very enjoyable despite the short duration.
April turned out to be the perfect time to visit the flats. There was water over most areas I saw, but some areas were dry and it was not too deep to drive around. I went with a tour company, which I would recommend. The town in Uyuni was a little weird after dark. It is like an old western town and kind of spooky.
I took the overnight bus back to La Paz. I would highly recommend this: I was able to book last minute, the seats were recliners and comfortable, I had a whole row to myself, they served food and cocoa tea, and it was very inexpensive.
In La Paz, I used Uber and walked around. Not my favorite LatAm city, but it’s interesting. The witches market is a little touristy. I was able to fly back into to Colombia and the US with the llama fetuses they sell (but do so at your own risk). It felt kind of grungey, like Bogotá but more extreme.
Bolivians feel pretty different than other LatAm cultures. They seem shyer? But I only had time to form a pretty shallow impression.