Not bad! Not bad at all. They say Blizzard Boulevard is the hardest, but I found it the easiest of them all. The road is wide and with easy turnings, unlike City Circuit.
Screwball Stadium is interesting. It still looks like a stadium, but has a more nascar look to me. Some of the corners are curved like in a Nascar race track. Found the first curve always threw me into the railings, so I have to slow down considerably to take the corner without crashing. But this was just my first run, might have needed some more practice.
Airborne Acres is cool. I see why they call it that. They have hills with sharp drops. So you end up flying over the hill if you going at a good speed. They have a lot of orchids as the scenery in this one. Found this track more challenging than the others.
My $0.02.