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.