Ya, I agree that playing in an open parking lot is tons of fun, can be safe, and is a good way to get a feel for snow.
Just remember that the most dangerous part of winter driving is unpredictable conditions. You will pull up to one snow covered stop sign and stop easily. Then the next one has sheer ice buried under snow. Looks exactly the same as the first, then you brake and don't slow a bit, sail through the intersection, and create another donor Mustang.
Take it real easy on the roads. Never "play" on the road, even if there is no one around. Cause you will hit unexpected patches.