Reading John Muir

I just started reading John Muir's 1st journal/book, A Thousand-mile Walk to the Gulf.  Muir, founder of the Sierra Club, walked from Indiana to Cedar Key, Florida in 1867 in order to "botanize".  I am just through the introduction and chapter 1 where Muir is visiting Mammoth Cave and crossing the Cumberland Mountains.  A good read and relatively short (211 pp).  An excellent book for the beginner naturalist or conservation enthusiast.