It's taper time!

I am getting really nervous as the marathon gets closer. I have been so sore and tired from all of the training. On Saturday I had to walk about a mile of my 18 miler. I have been constantly sore these past few weeks. The farthest I will run this week will be about 8 miles and then next week I will run way less. My body needs the break. Anyone have any last minute tips? I want to run fast, and get it over with!