They are being held at the Largo Nature center for the 1st, 3rd, and 4th races, just behind the intersection of Highland Ave. and East Bay Dr. It's in between the golf driving range and the old Winn Dixie(now closed) down the little road to the south. You can find out more at the Chainwheel Drive website (chainwheeldrive.com) about the divisions, start times, and locations. Once your in the website click on cyclocross series in the column on the left. THey have all the info and some pictures in there also. The second race is being held at Walsingham Park off of 102nd Ave. You can access 102nd from Clearwater/Largo road. The race courses consist of mostly grass, some pavement, and obsticales (Tree logs, Wooden board planks placed vertically so you have to dismount, run and hurdle them and remount, a hill you'll have to run up at the 2nd race, some mud and water), nothing technical like Alafia. Just alot of grunt and groan along with some cross specific skills for dismounting, remounting and carring of your bike. Mountain bikes work, some ride single speeds, and quite a few ride cyclocross bikes which are like a road bike but with narrow knobby tires or semi -slicks, though the bikes are a hair longer and not so twitchy as a road bike with chainrings (usually 2) bigger than a MTB, but smaller than a road bike for the terrain. There is a section on the Chainwheel website that gives instructions on the different cross skills. There is also a 3 minute video on youtube if you type in Citrus City Cyclocross Race. It's a fun, but grueling race and everyone is nice and supportive no matter what class your in (old and slow for me), like most MTB races. They have classes for everyone from 6-8, 9-11,12-14,16-18,Womens beginner, sport and expert 1-4, Mens A/Exp 1-2,B sport/3-4, C beg.5, Mens 35-44, and Mens 45+.