This place has had a few articles written about it. It is because of the singletrack trails and the caves. You can actually ride through some of the caves. It won't get extremely hot here either.
How to get there:
From Little Rock: Take Rt 40 west to the Morrilton exit. From there, go south on Rt 9 until you reach Rt 10. Rt 10 will take you west until you see signs for the national forest. From here just follow the signs.