Ilike them all - they each have their own attractions. NOU is "quirky" - this modern Euro style city on a South Pacific island where they all speak French! Some of the outer islands in the group still retain more of a traditional South Pacific feel. Vila/Vanuatu is a favourite - so laid back and easy going, ramshackle in a good way, very friendly locals. Avoid any "cruise days" (P&O Australia run 2 to 3 cruise ships around the Sth Pac) to get a better feel. I personally think 1 day is not enough as visiting the outer islands is a must for any trip to Vanuatu.