Hey Daydreamin' -
Within the Sandestin resort,
"Island Winds Sailing" has a sailboat and kayak rental business. Since it's a private business, you do not have to be a member or have a guest pass to rent (like you do with so many of the resort's play toys). "Island Winds Sailing" has been around for a few years, and last September the business was still there.
The owner's name is Barry Denman (sp?) and his cell phone number is: 850.699.2511 The sailboats are WindRider trimarans - very stable boats. A few years ago I put together a website for him, but I do not know if the rates are still the same, or if all his rental options are current or listed:
www.sailsandestin.com The site tells a bit more about the WindRider trimarans, too.
Hope this helps. I just joined the message board, or I would've posted this earlier...
Fair winds and full sails -
joanie