That sounds like a healthy weight. I can't picture how you look because I don't know your body type (If your curvy or not) but you should feel confident and have fun on vacation. If you really did want to loose weight or work on areas you can always exercise.
I am rather petite (5"1') and I weigh just the same as you and I wear bikinis because I have a nice mid-section. It depends on your body shape, though. Some people, even when they weigh NOTHING can not look good in a bikini! I suggest you go to a bathing suit shop, the people there are probably used to giving good advice and try on different styles and ask for the style that would compliment your body shape the best! Best of luck!
I think you would look fine in a bikini. As for styles that depends on your body shape. What size bust do you have? Do you have short legs/ long legs? Do you have a small/ medium/ large butt? If I know what body type you have I can recommend some styles.