For $75, she'll help you and your family build your very own castle on this prime Gulf of Mexico beach location on South Padre Island, Texas. Of course, there's a catch. Come high tide, your little piece of Texas realty will become just another snapshot in your holiday photo album. Wierenga is a specialist in beachfront contracting, with a penchant for towering castles, complete with fancy spires, arches and looming buttresses, all made out of sand.For the past 25 years, Wierenga's company, Sandy Feet, has been coaching vacationers in the art of sandcastle building."It's a great family experience, and I'm also getting more and more corporate clients using the process as a team-building exercise," she says, adding some final touches to a demonstration model she whipped up over the past hour. Wierenga has written three books on the subject, and her latest, Sandcastles Made Simple, offers step-by-step instructions and tips for building all sorts of sand creations."I have taught thousands of the previously turret-and-tower-impaired how to build their dream castles." She says that almost anyone can learn the basics after an hour's lesson.