Hello - I am flying into La Paz at 5am and I want to leave that same night at 9am on the overnight bus to Uyuni. I have no problem booking the bus but I am having trouble booking a day tour online. I assume (like with most places in the world) there will be tons of tours just waiting for us when we got on the bus. Does anyone know if that is true? Can I book a day trip upon arrival for that same day?