Not since Clark W. Griswold greased his metal saucer with the patented super-slippery kitchen lubricant in Christmas Vacation has the sport of sledding seen such death-defying audacity. For those wanting to pay tribute to old "Sparky," Green Acres is an ideal place to do just that. Granted, the place uses inner tubes rather than saucers, but when properly applied they can be just as effective. Just 15 minutes out from downtown St. Paul, the area caters to all levels of tubers. There's the Family Hill for parents with small children, or the Big Hill for those feeling a little more adventurous. And of course, at the end of it all there is the tow rope waiting to bring everyone back to the top--perfect for those of us who resist walking uphill under any circumstances whatsoever. Admission is $8.50 for adults and $6.50 for children, covering access not only to the slopes but also the chalet and the concession stand.