Translation of I am sorry in Spanish

Next winter I'm going to Spain, where i hope to study Spanish. It's easy to visit Germany. Munich is a big city in Bayern...It's a nice city. Lot's of restaurants, nice buildings, a lake nearby and really friendly people.
A year later we decided to make another trip. We have both been to Mexico and to Cuba, and the year before we were in South America, where we have visited several countries for five weeks.
We walked almost every alley in Cusco, stunned by its beauty and ignoring the developing altitude thickness, which resulted in the most horrible night of our lives.