I am not sure what your driving at,
but I will give it a try.

A retreat that is completely secret is very difficult to
pull off. There are so many people flying airplanes in
remote areas. They are looking to shoot game or varmints or
just to find remote cabins that they can loot. Government
planes are looking for poachers, Mary Jane gardens, etc.
Anybody who is hiding will be investigated.

A heavy tree cover with shelter under trees would be the
obvious way. Very limited gardening in random-looking
patches. No fences. Hunter-gatherer is an "if-y" existence.

It does not appeal to me.

Another approach is too migrate to an area with good soil
and sufficient water. Grow a big garden and have a few animals.
You would not hide-out and, on the contrary, would try to be
friendly to everyone, so you could fit-in and be accepted.
This is easier to do before a crisis than after, but I would
not count it out.
Why and how after a crisis? If you have
something to trade for a land-lease, or share-crop. Remember
that sometimes large tracks of fertile land go un-planted,
because of oil prices etc. There are also many niche lands
with good soil, that are not easily tilled with a tractor,
that a big land-owner might allow you to garden.

This sounds so good to me, I may retire to a garden-spot
any time now.