Mine is Dollywood in Pigeon Forge, TN (hands down). The setting is breathtaking, great rides, world-class shows, and the friendliest staff anywhere (sorry to say, but including WDW). Pigeon Forge is adjacent to Gatlinburg near all sorts of wonderful things to do and see (the muscle car museum, Great Smokey Mountain National Park, Ripley's Aquarium, hiking, rafting, and on and on). Thunderhead at Dollywood is my favorite wooden coaster anywhere. It's not the tallest or the fastest or the scariest, but it is the most fun (and I've been on a lot). That ride makes me giggle like a school girl and I can ride it over and over. The staff (many of whom have retired from other careers) are apparently well taken care of and it shows. You get the impression they really enjoy being there. If you're walking around with a map in your hand, before you can ask for directions an employee will often see you and ask when they can help you find. I've had that happen a couple times elsewhere, but here it's the norm. When I've needed directions to somewhere far, say the other side of the park, the employee stopped whatever they were doing (including working in a retail store) and walked us to where we wanted to go. I've not been treated better at any park, ever.
For thrill rides, if that's what you're in the mood for, it's Cedar Point. Doesn't have the atmosphere of some other parks, but sometimes you (I know I do) just want to ride thrilling rides and scream your head off.