Translation of runter

I hope you could understand my last letter to you. You see, when I write in Spanish I am not very confident. I always question myself and each and every sentence takes about fifteen minutes.
We added context sentences for some of our predefined vocabulary lessons. Our language trainer now supports multiple answers as well, however in our predefined lessons we did not implement this option.
Once at the island we climbed up the limestone mountain and got a superb view of the entire bay area. The cave by itself was also impressive and our guide explained about how this cave was discovered.