I like all sorts of maps, and I have made all sorts of maps. I generally like maps on which I can build cool stuff, maps with creative terrains, maps with a challenge to them...
I've had a fascination with making tunnel maps from the start (I have 6 of these now; would be 7, but I haven't gotten around to remaking that tunnel), and intermediate maps (solely for the purpose of connecting one map to another), pocket maps (tiny maps inside a larger map, such as a den inside a cliff wall), mountain maps, etc. Oh yeah, and building maps, which are maps that are a building in themselves. I LOVE building impressive structures on my maps.
The only problem with impressive structures is that they tend to cause a heckovalotta (real measurement there) lag. The map I'm working on now lags badly in several different directions and takes ages to load. But it looks nice! XD
I like exploring forest maps, they're just kinda tiresome to build. *trees everywhere XD* I like hiding cool rock structures in the middle of the trees to spice things up. My map Piccadilly Forest has an entire map hidden by one such structure. It forms a path to the gate for the Path of Stars
I've made tons of different sorts of maps, and I love making maps... XD I'd go on about it all day~