One week, a spring break trip. 4 girls, best friends named Chyna, Alison, Bekka (me) and Samantha (Sam.) 4 per cabin, all of them to their relief, together. 3 hiking groups, instructors named Sal, Minah and Joe. Chyna is with Bekka and Alison is with Sam.

What could possibly go wrong?

Setting-

San Francisco, California in USA (their school site.) 
Yosemite National Park

Basically, Exo M is seniors in high school and Exo K are juniors, only one year younger than them. Kinda assume they have the same ages..