SQUEE! That's adorable! We really don't give animals enough credit, it's amazing to see how many creatures just love to play for the heck of it!
Here's a crow using an old coffee can lid to snowboard down a roof!
Yes, they put food in a tray at the top, so they're probably not doing this for fun. However, it doesn't seem to be harming them and they don't seem to mind sliding down and climbing back up to try to get the food again. You would think that if they really didn't like it, they wouldn't go back up and try to get the food again. I'm only worried that when they slip, they might hit their head or bill on the tray.
You would think that being able to fly, showboarding would be sort of boring for a bird, but note how it takes the lid with it when it leaves to find better powder.