now take it easy.... nothing much more than a genle jog between now and race day. Get a good nights sleep and a meal than you can realy enjoy the night before to put you in a good frame of mind.
Race day a VERY gentle warm up a stretch before you start and RUN AT YOUR OWN PACE. It is very easy to get carried away and run at a pace that is too fast because you are in a crowd.
Have a time worked out that you should do, NOT could do for each mile and at the marker check if you are keeping to it and how you are feeling. If you feel it is a bit fast then slow it down.

BEST OF LUCK.