Translation of sacrum in Spanish

We drove to the hotel Rex where we made reservations in advance. However, once there, two American guys told us that they had a voucher from a travel agent and the price was like half of it.
Yes I do live in the United States of America. Thanks for contacting me! I am okay with my Spanish, but when creating sentences I'm terrible at using the right form of the la, el, un y una.
One hour later, at sun set, we overflew the amazing Misti volcano which is located right above Arequipa. The mountain had a golden glow and its view was breathtaking.