Staying at an all-inclusive resort
Sure, unlimited food and drinks sounds pretty damn fantastic at first, but the maddening realization that you just spent a massive lump sum on bottomless rail liquor and limitless frozen pizza will take the sails out of any vacation. Unless you’re opting for one of these slick resorts, do yourself a favor and skip it.
Trying to do too much
It's only natural to wanna justify the cost of your vacation by cramming as many activities and sights as possible into every 24-hour period. After all, you're only gonna be in Australia once, right?
Wrong. After your third day of nonstop touring, you'll be wishing you'd penciled in a day of rest at the pool. Trying to squeeze an outback walkabout and a Great Barrier Reef snorkeling session into four days is a great way to enjoy neither activity.
Being a slave to your original itinerary
Even if you plan your trip out right, stubbornly sticking to your original itinerary only ensures that you'll miss out on the random opportunities that pop up. Factoring in flexibility can be just as important as giving yourself some time to relax, and it can result in some pretty awesome experiences -- like catching live music in a dive bar you just so happen to be walking past on your way to the Sagrada Familia.