to get to Tanna you will be flying to and from Port Vila
places to think about,
Hideaway Island; 15mins from port vila by bus, bungalow accom, no tv, dvd, phones. dive shop on the island so 3 dives a day mins away from dive sites and shore dives, lots of pretty fish and they have a purpose scuttled small wreck as well. eat the coconut pie,
http://www.hideaway.com.vu/index.htm, if money is an issue ask about the "twin share rooms"...its like a private dorm room for one couple only so much more privacy. we've been to hideaway 3 times i think
Tranquility Island; a 20min bus trip and boat trip from port vila - very eco VERY basic but great diving on site and its a turtle sanctuary also.
http://www.southpacdivecruise.com.vu/index.html
if diving at Santo, Bokissa Resort if you have $$$ or Deco Stop for better pricing and if you like your beef, dont forget the grass fed santo beef, very happy cows in santo!
if wrecks are your thing, santo and the Coolidge cannot be beaten
if baseing yourself in Port Vila, mike and maggie crawford from bigblue (
http://www.bigbluevanuatu.com/ ) are good people
on your down day in Port Vila - take your cossies and dive boots and go to the Cascades... i always like this place.
hope this info helps
cheers