It's a room with bare hardwood floors, bare white walls, no windows, no furnishings except a straight-backed wooden chair.
It's a gloomy forest with very little light, too quiet, forboding, difficult to traverse due to lots of ground vegetation.
The path is barely visible, rarely travelled, narrow, difficult to navigate due to blackberry bushes and lots of other obstructions.
There is a small pond underneath a waterfall, and a small creek leading away from the pond. The water is clear and fresh and sparkles in the sun. The waterfall is not very high, and makes a moderate roaring noise.
It's a small green plastic Tupperware cup.
The key is a small brass-coloured stainless steel key. It likely unlocks a small briefcase or storage box.