I will start by saying that I have never been on assignment in Hawaii and I do not travel with a family:
Hawaii, typically, does not pay very well. Most companies do shared housing, so if you went with a family, I think that there would be difficulties. Housing is very expensive/sparse there for short term. One option would be to contract with a hospital directly. I have found payrates quoted (for Hawaii, between $24 - 29/hr.
Just noticed that the original post was in 2001. Wonder if she ever went. I will stop with my response now.