Translation of cerium in Spanish

Our day came to an end and Samu brought us back to the hotel. We agreed to take a ride with him one more time and that was on the way to the airport. We took his cellphone number just in case.
I am learning Spanish in university but I also have to improve it for private reasons. Do you have any suggestions. It is giving me a hard time lately as it is difficult. I need to be very patient.
We decided to make a one day trip to Bolivia, which turned out to be the correct decision. Instead of driving all the way up to the Salar de Uyuni, we stayed close to Chile and visited the area of the lagoons.