If you're looking for something to do in Phuket instead of just lying on the beach all day, Soi Dog Foundation welcomes visitors. Their animal shelter has hundreds of dogs and cats (and puppies!), and you can take a tour of the shelter and play with the animals.
Besides visiting, you can volunteer there for days, weeks, or months. You don't need any experience. Soi Dog has volunteers from all around the world who walk dogs and spend time with the animals, especially the shy ones who need attention.