We are told to be "diligent to enter" God's rest. For me, I enter God's rest as soon as I capture my thoughts and put them on Him and all that He is. Sometimes it helps to have something lovely like the ocean to look at or listen to in order to be pulled away from the negative thoughts that are causing me unrest. But since I may not always have this option available to me, I must carry God's Word in my heart and mind at all times. Then resting in Him shall just come naturally.