My neck (and the rest of my body) are really sore, any advice?

I went snowboarding for the first time this weekend and as I expected, I am incredibly sore. I also have a cold.

I have been switching between taking Motrin and some cold medicines (like Advil Cold and Sinus) and the Motrin seems to be working best, but what else can I do for my neck?
I don’t have a heating pad, but have a scarf that warms up in the microwave – so I’m going to try that, it just doesn’t stay hot for too long.