Do a search of this site for Hawaii exchanges and you'll find several posts on this topic. We did an excange in 1998. Stayed at the Cliffs Club on Kauai. It was very nice (not quite Disney standard, but comfortable, spacious & clean) and we used 198 points in the exchange. (1 bedroom/2 bath unit that would sleep 4)
We hope to return to Hawaii spring of 2002 or 2003. We are going to try and do an exchange with a co-worker of mine who owns two weeks at an RCI resort on Kauai.
Many
DVC members here have time shares at other resorts and have a wealth of helpful information about exchanging. They also recommend you join TUG..a timeshare usergroup. I joined, and the information out there is not to be missed. Very helpful reviews on all resorts.
WWW.tug2.com
Good luck with your plans!