I would love to have a mixture of maps, outdoor in field/forest, in a city, a metro station, outskirts of a city, underground in some cave (with some infrastructure), in a canyon, a bank, get creative. I will probably accept anything I like the 'feel' of. Try not to make something like a maze, make it so a first time player would know where to go and not get lost.
Try to keep the brickcount under 15k, maybe even under 10k
Edit: keep it more modern/industrial themes, no futuristic or olden time builds.