Ask all of them for their activities programme to decide where to spend the extra day. Cultural programme might be very different than what you think, for example hiking alongside rice fields wirh a guide telling about rice farming, ending in a perfect bale where your delicious and romantic breakfast is set up for you to enjoy while lounging and enjoying the view and each other (amandari). I think jiwo ist most wow in terms of rooms (normal category), architecture and view and has the best private bale outside for lounging) but you might want to add an extra day for just relaxing at the end or in the beginning (dont forget jet lag or the fact that you might be pretty exhausted after the big day) at a beach location if thats your favourite place for complete chilling.