Translation of radiactivo

I like writting you messages although most of it is really pointless. I mean it is very good for my English studies, but except that I could not understand why you would be interested in reading it.
The trip included a lot of walking and the guide told us the history of this region, of the Chiapas state and also how it evolved in the context of the entire Mexican country. Very interesting!!!
The ship stopped in the middle of several limestone islands and passengers went swimming in the middle of the sea. There were dozens of other boats around us as the area was very touristy.