That's basically what they do. Our patio was't that big, it was about 7m x 4m, with a 2mx2m patch of grass that we sometimes used to plant stuff, and the rest was cemented. The girl either chilled in his tube under the water, which we changed twice a day, or in the grass, or she would for some reason walk around the cementer part. We use to play with a ball with her, she use to topple it with her head and then "pursue" it, she was fun xD