Before I moved to St. Louis last year, my impressions of the city were based mainly on memories from family trips in my childhood, in which, of course, the famous Arch loomed larger than anything else. Well, except for the Christmas when it snowed 12 inches -- one of only two white Christmases I've experienced.Ever since then, I've associated St. Louis with wintertime. And now I'm living here -- and it's winter! So what does an honest-to-goodness St. Louisan do for fun in "the Lou" when the weather turns cold?I set out to find out one December weekend, heading first to Forest Park to check out the Steinberg Skating Rink. I knew that I wasn't going to be able to relive that year when I was 15 -- it was unseasonably warm, and there wasn't any snow on the ground -- but I figured that I could at least pretend that it was the depths of winter while gliding around on the ice.