Maybe make a park/field map like this:
(http://architecturas.com/wp-content/uploads/2011/01/beautiful-outdoor-garden-decor-640x426.jpg)
With a maze:
(http://farm2.static.flickr.com/1298/1352407254_55114cfc70.jpg)
And a place like this:
(http://www.runawayjane.com/wp-content/uploads/2011/01/parks-in-paris.jpg)
Just throwing ideas everywhere.
A small park or neighbor hood would be cool or a Farm. A forest with a camp in it would be a great idea for a warriors map. I believe there's meshes you can find to form a den. I've been in a warriors map that had a couple "fresh-kill" piles in it. A cave could be added to make the Moonpool (I think it's called) or you can add another map in it that leads you to a map called that. A burned out or abandoned woods or forest would be a good idea as someone else said. ^^