I avoided this section for years because of the signs that state,"Expert Riders Only-This trail contains extremely challenging features and riding these features may result in serious injury or death!" "Black Diamond: Most Difficult!"
Well, I'm not an expert but I finally did try the trail and it has a couple of jumps that exceed the skill level of a blue/black rider but all of those jumps have bypass areas where you can take smaller jumps. I now ride this trail every chance that I can. It's very fun and has both intermediate and pro features so riders can improve abilities with practice. At places, the trail forks with little signs marking the blue and black routes so an intermediate rider does not accidentally find themselves in trouble.
It does have an aggressive dive into a deep hollow with a sharp, but short, climb out where it merges back into Southern Mission
. Where the trail bottoms out is a nice berm where it is perpetually wet and even muddy after a rain. As can be seen on the map, the trail loops back over itself and this is an area where riders can take laps down a few jumps then climb out and do it again.
I've seen kids ride the loop for hours. If you are a beginner, this will be over your head so I would advise you to avoid Cottontail. If you are a solid upper-intermediate and want to test your skill level, you can ride the small stuff then graduate up to more.
Don't be fooled by the name, but also, don't let the signs intimidate you if you have solid riding skills and some experience with jumps.