Recycle plastic six-pack plastic ring holders into this. The saved dolphins won't help you though:
The evidence, it seems, doesn't support claims that children and some adults suffering from physical and mental illnesses can improve their health by getting in the water and interacting with dolphins (usually bottlenose dolphins, Tursiops truncatus). Every now and then a study pops up that purports to find real benefits to DAT, but when Lori Marino and Scott O. Lilienfeld of Emory University in Georgia put those studies under the microscope, they found all suffered from serious methodological shortcomings.