I've never been a fan of really big dungeons, so most of my games have had small locations or been overland /wilderness based. Ruins are always a good go, with a few small cellar complexes, sewer tunnels to explore as well as the aboveground ruins.
I also like ship-based adventures . . . I have a couple of players who HATE when I mention a sea voyage, they act like Mr. T trying to be coaxed onto an airplane :D gotta love that.