Keep it simple
You're probably going to have your photo taken a lot while you're away, so you don't want to overdo it, keep it consistent, and avoid anything too crazy. Remember that you'll be doing a lot of walking, hence a lot of sweating, so the lighter the makeup, the better. Skipping foundation is probably a good idea as it lets your skin breathe, and keeps it from looking awkward when melting inevitably occurs. A bit of powder, bronzer, and waterproof eyeliner and mascara go a long way.
A bright lip to brighten your look
Sunglasses are an important part of any good vay-cay, so you have to play up what is left visible. If you're going super light on the eye makeup, feel free to go for a fun and bold lip colour – red, coral, or fuschia are great examples of the endless possibilities, with shades available that suit any skin colour. Just think of accenting your holiday-smile!
Protect your skin
Remember that SPF is mega important when you're out in the sun all day – face and chest need to have protection reapplied throughout the day, and a rimmed hat can save you, while accenting your style. Nothing makes for worse photos than a sunburn.