Stay Hydrated

Even if you're surrounded by it on all sides, it's easy to forget to drink your water. But we all know the first rule of fit club: Hydrate! Hydrate! Hydrate! Especially if you plan on day-drinking under the sun. Heat plus alcohol could be a dangerous combo, so sipping on plenty of water throughout the day will not only keep you slim - it may also keep you from passing out. That's the kind of crazy vacation story you don't want to tell.

[Photo via @fijiwater]

10 of 10