The best book I have ever read on keeping the Lord’s Day was written by a friend, Stuart Bryan. The book is called The Taste of Sabbath. You can go over to Credenda, and read something posted there on the same subject. In his bio at the bottom of the article, you can click through to the book.
There are two kinds of kings — those who feed their people, and those who eat their people. When our king, the Lord Jesus, gave us the Lord’s Day, He was not devouring us, He was feeding us. It is a feast, not a fast.