I stopped in here on my way between Banff and Fernie just for one night but stayed for three. I found so many hikes to do in the area that had virtually no other people on them. I will be heading back there this summer (2010) to explore some more trails in the area.
If you have a car, check out Lussier Hot Springs, about an hour from Radium. It's free, rustic, remote, natural, and you can soak under the stars with the beverage of your choice. And it's clothing optional at night.