Also, on hard pack, some sort of light crampon style traction device like Kahtoola Micro-spikes is very useful. I could have used something like that in Yosemite a few years ago just for walking around the Village. REI sells a variety of them-
http://www.rei.com/category/12221603They seem to be pretty popular in New England where the trails get iced over, but snowshoes may not be necessary.