I would spend this entire rainy day in the barn. I would be sitting in a lawn chair in Fancy's stall, reading my book and drinking hot tea from my hot cup. I would be savoring the smell of alfalfa hay and listening to my horse contentedly munching.
Of course, Fancy wouldn't actually let me just sit there and read... she would be insistent that I rub her tummy and give her cookies.
As for Caspian... well, he'd probably be nibbling on my book, kicking up his heels or napping.
Unfortunately, it isn't up to me, so I'm at work, instead.