Let's calculate the volume of each cube.
5*5*5=125 meters cube
4*4*4=64 meters cube
the difference 125-64=61
Answer: Tom Sawyer had the logical plan of escape to free Jim
4. hints more at the subject going to many future places "everywhere you may go" - he is expected to go "everywhere". 5. is more of an open, 'nobody knows where you'll go' kind of sentence, 6. is quite alike to 5. If you have to pick one for fluency, I think that 5 flows the best.
