In Christian circles, even among those who do believe in keeping the ten commandments, there has still been confusion over the fourth commandment and whether we should be keeping the Sabbath on the seventh day that was ordained, sanctified and made Holy by God at the time of creation.
To be able to develop a close relationship with God, we need to spend quality time with Him. He set aside this day as a special time of communion with Him. It is a time where we can study His Word, and let His Holy Spirit speak to us through it. A time that we can spend in earnest prayer, talking to Him, praising and worshiping Him.
It is also a time that we can look at nature and reflect on all the wonderful creations that He has made. And finally, it is a time that we can spend with fellow believers, to worship together in song and have fellowship with each other, encouraging one another and building up each other