I don't like to let my self have a rest day unless its really necessary and my body is really asking for it. The #1 thing you can do when training is listen to your body. Today, my body was asking for a day off, so I gave it to it. It can sometimes be more beneficial for your progress to take a day off once in a while and let your body and mind rest, rather than running your body into the ground.
I think taking today off was a good idea and was definitely needed. I feel good tonight, mentally fresh and physically ready for tomorrow's long ride with Snapple Lyte Water. Not sure on the distance yet, but I'll be sure to log it in tomorrow. Until then, its time to get some sleep.