Have you seen those little tiny library structures in front yards? They are perfect for cottages!
Especially if you or your neighbors rent out the cottage, these could see a lot of traffic! Exchanging books is a wonderful way to spread the experience of getting cozy at the cottage with a good book.
If you have neighbors close by it might be a good idea to check with them first. They might even want to participate!
There are many places to buy them online, or you could try your hand at building one!