What happened in Las Vegas?

A girl named Riley Clarke and a boy named Mason Bennet. Riley has been enemies with Mason Bennet for her whole life, he's just so annoying. He keeps saying that he's smarter than her, Riley thinks that's not true. They're both fighting to be at the top of their class since they started school together. 3 years in a row it has been Riley but Mason wants to change that this year. Because their school exist for 50 years, Mountain High is celebrating. All classes are sorted into groups to go to a city which is: Las Vegas, Paris and New York City. Riley really hopes to go with Aria to NYC. Mason just hopes to be with his mate Ethan, he doesn't care where he goes he just wants to have fun. But then Riley isn't sorted with her best friend.. but with Mason. Ethan is sorted with another mate of Mason named Owen. Riley thinks this vacation is going to be a disaster, Mason and Riley are sorted to be paired and need to do activities together. Mason notices how he starts to get feelings for Riley. Riley is starting to get feelings too but she doesn't want to admit it because he is and always be her enemy. Then there's that pick me girl, Emilia, who keeps trying to get with Mason. But she doesn't care, right? Or does she care...