Fun, tight singletrack at a small ski hill.
<b>Update 7/28/14 by jonmrtn:</b>
Crystal Ridge is now The Rock sports complex since 2013. They transformed the hill into a short downhill course with some green, blue and black trails. The Rock sports complex is next to the Alpha trail which is still free and connects to the downhill runs if you choose to stay on into the woods. It's a great place to hone your skills if in the area.
http://maps.google.com/maps?q=crystal+ridge,+wi&hl=en&ll=42.92752,-88.017225&spn=0.035257,0.084972&sll=42.97437,-89.040692&sspn=0.008808,0.021243&hq=crystal+ridge,&hnear=Wisconsin&t=m&fll=42.958935,-88.008385&fspn=0.140956,0.33989&z=14&iwloc=A
http://www.singletracks.com/item.php?c=1&i=5405