[Kittah]

I could imagine a few tree groupings scattered across the area would be nice. Fill in a mushroom or three around the trees, sort of clinging to its shade. Detail the rest with some grass clumps, heavier away from the pathways but leaving a few to make it look good close to them too.

For less natural detail, I'd suggest some fences and hedges, signposts giving directions and a few "gardens" of bushes or something.