Hi Clueless
30 days is really early but I guess you've made up your mind to go.
I've never been but I'm reliably informed that Vanuatu has a *lot* to offer in terms of things to do that don't need alcohol.
Just make sure that whoever you're going with knows of your intention to stay a non drinker - I think that can only help.
There even have an AA presence there. Even if you're not an AA adherent it's good to know.
In the evenings, look out for what other activities you can do rather than hanging in the bar?
It may not be easy but I think it's far from impossible.
D