My hubby and I went for a three day mountain hike, and it was one of the most enjoyable experiences I've ever had. I was so sore I could barely move for a week afterwards, but I lost 4 lbs.

I think it was about a 20 mile loop; there was a huge feeling of accomplishment afterwards.

And, being in the woods for three days really makes you appreciate today's modern conveniences, but at the same time you realize that
being without those conveniences isn't so terrible either.
Best of luck on your hike!