You've decided to take the plunge and go on Naked and Afraid. 
1.  How would you prepare?
2.  What are your strengths and weaknesses?
3.  What mistakes do other contestants make?
4.  Could you finish?  What would make you tap?

OK, another thread is bombing.  That seems to be the norm on Other Topics these days.  I think it's a good topic so I'll prime the well a little more.
    Some mistakes that contestants make... the first involves shelters.  They're usually too elaborate and take too much time and effort.  A teepee or lean to is the way to go.  Simple, quick, effective.  This isn't a pretty shelter contest.  Also contestants will "complete" their shelter on the first or second day then do nothing else to it the rest of the challenge.  Wrong!   You should be adding to and improving your shelter every day.  It's never done.
      Another is chopping wood.  Everyone wants to be Paul Bunyan.  Chopping, chopping, chopping is a total waste of valuable energy.  As kids we built our shelters with no tools at all.  No wood chopping.  And we made darned good ones.  Chopping firewood... a totally unnecessary endeavor.  Make your main campfire outside of your shelter.  Then let your fire do the chopping.  Burn your sticks and logs in half, then in half again, as many times as necessary.  Easy.  You are in a starvathon. You want to conserve every calorie and bit of energy possible.  Camp easy and smart. 
     Also most of the challenges are done in areas with dangerous predators.  Therefore the very first thing I would do after meeting my naked partner is make a six foot spear.  There is no way I'm walking around a place where animals want to eat me without one.

IG is along my line of thinking.  Intentionally introducing stress triggers helps the body adapt to them.

I like the idea RM, of toughening up the feet.  I would totally do that.

But rather than fattening up (which I'm also already pretty good on) I would start doing stretches of time fasting.  I've done intermittent fasting before.  It's definitely tough if you're not used to it.  In the past I would do 18 - 24 hour sessions (from dinner one night until the next night).  Around lunch the next day I would notice a drop in energy and mental focus.  So I would start doing that along side with planned mental and physical activities to get myself used to it.

I'm also admittedly no outdoor survivalist.  I've watched plenty of Survivorman, but watching and doing are two different things.  I'd start reading up on and practicing skills to obtain the three main starting points.  Fire, water, and shelter.  Also gaining more knowledge about what is edible and what isn't would be very helpful.

I will note that I've never seen the show, so I just talking in general about being dropped in a location and needing to survive.

    What would make me tap?  I've gone as long as two weeks without solid food once in the hospital and for one week six times.  As long as I could get water I'd be OK.  Besides getting sick or injured my main fear would be chiggers.  I'm from New Jersey.  The mosquito is our state bird and we have an abundance of ticks, Deer Flies, Horse Flies, etc.  Such pests are a way of life so I could probably deal with them.  Chiggers are another matter.  If they put me in an area with lots of chiggers I probably wouldn't make it.  Chiggers tear me up. 
    If it rained on me for many days without a break that might make me give up too.  I've camped in the rain and spent a whole month at Ft. Campbell out in the rain in December.  But that was with gear.  Being naked in the rain for like a whole week might make me quit. 

I like to think of myself as robust, but I also know I get pretty damn whiny when I'm uncomfortable. I'm not sure how well I would do, the cold, wet, and bugs would really wear on me. Throw in being hungry for 3 weeks, It would be pretty tough.

   There is one other way that I would prepare.  A big problem for many of the contestants is sunburn. 
    For a good portion of my life there was no such thing as sunscreen.  We knew nothing of ozone layer depletion.  Getting a good, dark tan was considered healthy.  We didn't know that the sun could cause skin cancer. 
    This is what everyone did.  Once the weather started getting warm we would deliberately get a sunburn.  In a week of so that burned layer of skin would peel off and the next layer of skin would be more resistant to the sun and would tan instead of burn. That's why so many of us have skin cancer today. 
    If I knew I was going to be on Naked and Afraid I would, as a one time thing,  deliberately get a sunburn, let that peel off, then get a good tan.  At that point I could scratch sunburn from my list of concerns.