My family and I each did the Westin Ocean Resort Villas timeshare deal in Maui in October 2008. It was ~$600 for 5 nights and included a free rental car from Avis and a $100 resort credit.
It was an Amex affiliated offer open to people in certain states but was advertised on the web. The offer said two or more families could not go during the same time, but my family, my parents and my sister and her family were each able to register for the same dates.
We were in and out of the timeshare presentation in about an hour. The hotel was nice (not very hawaiian), but I much preferred visiting Wailea or even the main part of Kaanapali.