classmates would dive into one last adventure together. a trip to aruba. a tradition mountainbrook seniors spent the entire year looking forward to. >> everyone was going on that trip. all of our good friends, and stuff like that. everybody was just so excited. we couldn't wait to get down there. >> natalee's dad, however, was nervous. there were only seven chaperones. in aruba, the legal drinking age was 18. but natalee had always been responsible and her mother and stepfather thought she had earned it. >> this was her reward for working so hard and getting a scholarship to alabama. >> a reward that promised a tropical paradise. an island full of fun, adventure and partying. lots of partying. with old friends, and new ones. like joran van der sloot, a charming and outgoing young man