Im 18 with a free trip to maui should i go?

My uncle and aunt have planned a trip to maui and my wife and i are trying to decide if we should go ( this is her yahoo account) but the thing is we dont know what we need to go and what is there to do there and is there anything we should watch out for. Is it fun there are they very expensive ,what are the resorts like there?? So could someone who knows about it or been there tell me do's donts where to go to eat and things like that thanks