Don found it.

He and I came for a gallop in the woods and I let him choose his own paths.

I have been in his charge all the morning.
I haven't the least idea where we are.

There, Don! you have had enough and you are splashing us dreadfully.

Come back!" She backed the horse out of the water and turned his head toward the woods.
"It is great fun to be lost," she observed.