Translation of tactless in German

I hope you can understand the corrections this way... Two small errors. let me know if there is a word or sentence or phrase that you didn't understand! I will try to think more on the "since" question...
Tam Coc was a place where the river ran through different limestone mountains. The view was amazing. However, the two hundred other boats on the river really destroyed the atmosphere.
We had decided to fly to Lima (instead of Buenos Aires, Argentina) and to visit Machu Picchu just a few weeks before leaving Europe.