Wow, Vanuata looks awesome...
Talk to your Dr. When I go on vacation I go on a pump vacation as well. I don't want to have to worry about the site when I'm on the beach or in the water, so I go back to shots for a week (doing it tomorrow - I leave for the US Virgin Islands Friday). Obviously it's not totally leaving the big D at home, but it does allow you (in my opinion) to do typical vacation stuff more easily. When I come home I just hook back up like nothing happened.
I saw on your profile you're almost a year in. The only think I can say is it DOES get easier, and after 6 yrs I honestly don't know what it would be like to not wake up every morning with the pump tubing all wrapped around me or to not count the carbs I'm eating! Good Luck, and don't ever let it stop you from doing anything.
Enjoy the trip!