It is warm. There are bookshelves, tables and countertops, all littered with toys, some messy, some neatly stacked. The walls are painted pleasing pastels with the occassional mini-mural of something like a balloon or the sun. There are old, worn out, soft armchairs and one rocking chair. A flimsy looking closet holds thick coats and tiny shoes.
The trees are birch and oak and bright light falls in patches on the ground as it is filtered through the leaves above.
There are minor obstructions as the path was not designed intentionally but rather carved out by generations of hikers. Branches and logs impede many stretches, but they are easily scaled.
The path ends at a lazy river with bright leaves floating peacefully by. You can hear the soft trickle of water as it falls over rocks and goes down gentle inclines. The water is green, a reflection of the mossy bottom, and beautiful.
The flask is thin and made of pewter. It's carrying case is old, cracked and leather.
It probably unlocks the home of a previously passing by hiker. Sorry dude, you sleep on the porch tonight.