You manage to get the door open and shuffle back outside to the park. Except... you blink and look around. This isn't the park! You are in a rolling field, fenced in on all sides with white rails. Even the bathroom you just left is gone, though you see the pile of horse manure in the grass.
It takes you a moment to realize that you are not seeing colors very well. You can still make out the green of the grass, and the blue of the sky, but they are very washed out. You can see a lot more around you than normal, probably because of the placement of your eyes, but the view directly ahead is split by your horse's snout.
As you try to sort things out, you see a boy come to the fence an wave for you to come over to him. You also catch the scent of horses on the far side of the pasture, including a few mares who might be interested in meeting you.