Sunscreen alert! Jessica and the Unicorns are headed for the balmy, boy-filled beaches of Hawaii! From the personal journal of soon-to-be eighth grader Jessica Wakefield: Okay, you do the math: friends + summer - parents + Hawaii.  What does that equal? Aloha? The answer should be obvious. But it isn't.  This Hawaiian vacation is kind of...  freaky.  And I'm not even sure why.  All I know is that my friends aren't who I thought they were...  not anymore.  Have they changed? Or have I?