Clear age division.

The fact that high school and college level students where mixed in is unacceptable. This is dangerous for older men such as myself. Also, being forced to spend time with american students made the trips horrible and painful to go on. I had an awful time being around literally children that legally I had no desire or reason to be around. such as ages 15-19

Create a vivid separation of the students by age and your internships will run much more smoothly and safely. Also give students the options to go on different trips as well.