I would recommend to arrive early and do several test shots @ iso 6400-8000 to see if it to your liking. I shoot with the D3S and I still get great images especially for 4x6 prints and web images. I also choose spot metering since your subject is most important, it has worked well for me. Just my 2 cents.
Do remember to keep your shutter speed up to par, you may be surprised what type of fill light you will get with the light reflecting from the ice.