Not getting travel insurance
Like all insurance, you pay for travel insurance in the hopes that you won’t need it; that said, you’ve probably already dropped a sizable sum on your trip to Aruba, so why not tack on an extra couple hundred dollars for some peace of mind? Yes, you could take your chances and hope that Hurricane Denzel doesn’t hit when you’re relaxing on the beach, or that your tandem skydive instructor knows what he's doing, but if the defecation hits the oscillation, you’re out a thousand-dollar vacation. Or a life.
Carrying your passport with you
You’d be surprised how many people still leave the hotel holding the one thing that'll allow them to return to their home country safely. If you absolutely need to carry your passport for identification purposes, make a photocopy and leave the original in your hotel safe. Seriously, this should be a no-brainer: 160,050 UK passports were either lost or stolen abroad between 2008 and 2013 alone. If you do lose it though, here's how you get a new one while abroad.