Hamner Springs Thermal Pools - bloody nice, especially in winter when it is completely covered in snow (and you can clear a pool pretty quickly by starting a snowball fight with your brother ;) The thermal pools come in all shapes and sizes, and there's something there to keep the brats amused also. Not long after the hydro-slides first opened they apparently had to be shut down and altered slightly because too many people were coming out the bottom all black and blue with injuries hehe.