how about a building with fancy architecture, and a surrounding fancy garden.
hl maps are made of always indoors or connected halways. (much like a carved playground out of a big block of map)
there are not much big building within a yard that has a useful playground in it. because of engine capabilites
we may challenge ourselves with this compo.
here is sample map ideas:
-a giant tree house.
-a cheateu or castle.
-a command base on desert
-surface units of black mesa.
-a campsite on top of a hill.
but we shouldnt sacrifice gameplay or story it also should have a gameplay function.
for example you can enter and find a way out from frankensteins castle. you may make your indoor area smaller than outdoor but it should be used in main gameplay
and you may add a bit hills or cliffs or a fence around because of not breaking the realism ilusion
you may surround your open area only with a skybox, but its not much suitable to this compo because you can make any hallway map to an open space map with that. so your map should not be like a hallway map surrounded with a skybox. you may use skybox anyway.
you are free to choose garden/building ratio. and you are also free to not place your building in the middle. and also you are free to add any amount of subsurface playground areas as well.
for example you may put your 3 wall of your building looking to your garden, and your 4th wall may have a window with a skybox texture. so you can increase your un interrupted garden area. or you may add an underground wine cellar to your castle. or you may add an abondoned mine on your campsite.
tl;dr key is getting rid hallways and make map more open.
winning criterias might be, fancyness or wideness and quality of wide space. or just arcitecture or even gameplay. or lowness of surrounding cliff. because lower cliff makes maps more open spaced. but you also consider realism illusion otherwise your wide area designs quality gets lower so your compo entrys place will not gonna get higher.
goldsource is preffered because you can make these kind of map in source already. bu if you use source you may not add any hallway like element to your map.
PS:i got bored with writing and quitted from my idea when writing this article.But im gonna make some map some time without hallways.