I've travelled quite a bit and have mostly covered all the "common touristy" countries. Instead of a particular country/city, I'd say that Disneyland is my favourite/nicest place to visit.

I'll make it a point to drop by any Disneyland every single time if there's one in the region I'm at. (and yes, I've been to the various Disneylands repeatedly over the years! 😍)