As of Sunday the croom trails were in suprisingly good shape. Looks like they've been getting a decent amount of rain up there and the sand wasn't bad at all. Take a map (and a compass if you don't have a good natural sense of direction) and pay attention; I've had to help a few newbies find their way back to the car. As far as trails are concerned, it depends on how far you want to ride. Definitely try to get to the pits area of the blue trail (~7-12 miles north of parking area 1). If you want a long ride, start at Tucker hill, take the red trail over to the blue, ride north around the blue and reconnect with the yellow near the end. That's a lot of miles in this heat...and you will almost always be within a mile or two of bailing back to Croom Rd. and riding back to the parking area.
When are you planning to go? I'll be out there Friday evening with some new riders (taking it very slow), and maybe riding Sunday morning at a B-/B pace.