We actually started with wanting to visit the salt flats in Bolivia. As we went through the tour details, we realized about high elevations and wanted to gradually move-up. So, we added Santa Cruz and Sucre before moving to La Paz, Titicaca and Uyuni. We are glad we did that as we got acclimatized well, did not fall sick and enjoyed the trip. Wandering through the Bolivian desert and Atacama was really a great trip.
We loved everything in our trip. We visited various cities and landscapes, it was amazing. Definitely the best part was the Uyuni salt flats. We loved it. We had wonderful guides who were passionate, helpful and took us to all good places.
Not really worst; but while we had private tours in Bolivia, it was semi-private tours in Atacama, Chile. This is not a complaint. We really loved it; but if they had assembled the tourists with same language in a group, it would have been better. We had people with 3 different languages and the guide had to repeat the same thing 3 different times and we felt we did not get the full picture.