I completed the ride up Hurricane Ridge on 8/5. They close the road inside the park from vehicles from 7am - 12 (noon) for the ride. I think there were about 400 riders and we had beautiful weather. You have the option of starting at Peninsula College (17 miles and 4800' elevation gain) or at the park entry (12 miles and over 3300' elevation gain). I chose to start at the college (silly girl). It was a grueling ride, but the views were absolutely stunning (also got to ride through 3 tunnels). The descent was awesome! And $5 from every registered rider goes to developing the Olympic Discovery trail (a good cause). I highly recommend it to folks in the NW area.
FYI...the pictures don't do it justice ;)