LOVE. SAMMI SHOULDN'T BE SCARED BECAUSE SHE IS GORGEOUS.
Really, just relax and go with it. Your idea for what to wear sounds great. Just act like you belong and no one will look twice at you.
I would suggest trying to get short shorts in something that isn't denim if you're going to swim though... Denim's a pain when wet. I got into a water fight with one of my friends a couple weeks ago while wearing jean shorts and had a lot of trouble getting them off.
It has always been the prerogative of children and half-wits to point out that the emperor has no clothes. But the half-wit remains a half-wit, and the emperor remains an emperor.
--Dream, The Sandman