Ken, If I were you, I'd spend those 3 days atv park hopping around Jacksonville. You could spend 1 day each at Shiloh Ridge (alto), Mud Creek (jacksonville) and River Run park (jacksonville). I've hit 2 of them in 1 day, but never done all 3 in 1 weekend.
IMO, Shiloh Ridge offers the most variety...hills, pastures, mud pits for big Trucks and ATVs, wooded trails, etc.
Happy trails...:)