I guess it will be as difficult as moving anywhere else. Once we move there permantly I will volunteer at the hospital. We lived in Vila for 4 months last year, and found all the ex-pats to be very friendly. The Grand (aka Sebel) apparently have a happy hour Wednesday and Friday nights for tourists and ex-pats. We haven't been yet, but someone said it was a great place for net working, I assume that means meeting new people as well. There is a ladies group who meet for lunch (I'm not sure how often) Of course, one has to be invited :-) :-) to share this with other ex-pat women.
Hope you aren't too lonely???