Translation of convulsionar

Not only will the trip be a success for LIF but for many students it will be a great experience too. We do not care about the stories about us which have been published during the last few months.
The ride took us through mountainous areas, covered with dark green forest, with so many curves that I got sick. I wanted to vomit but I held myself back, as there were so many other next to me.
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.