To get to Laguna Verde you can hire a car and travel independently or jump on an organized tour. There is no single day tour to Laguna Verde, you will find only multi-day tours on those attractions: Laguna Verde, Laguna Blanca, Laguna Colorada and the Salar de Uyuni
Uyuni Salt Flat
The easiest way to get there is by bus. Most major cities in Bolivia offer bus routes to Uyuni.