Do you have a car loan; or a car worth anything? Many credit unions will refinance a car at 1.5%-2.5% these days. I wouldn't normally recommend a secured loan over an unsecured loan, but the difference between 1.5% and the 10% that most timeshare lending services offer is pretty significant.
Those timeshare loans are unsecured, right? I think they're personal loans and not liens against the real estate contract.