@Cate64 - you're a champion! Woo hoo!
@Ann-Marie_BCNA - woo hoo! Good on you!
Stretch, stretch and more stretch will help with the aching muscles. I used to throw up at the end of each half and full marathon run otherwise I was fine - I had a very good coach who insisted on warm up and cool down stretching, something I still do today! One of the other groups here the coach didn't believe in stretching so I guess it's what you are comfortable with!
Plenty of water leading up to the race, during the race and afterwards helps with recovery.
Congratulations as it is an exhilarating thing to do!
Take care