Shouldn't Amazon be more interested in the economic conditions, rather than hiking and biking and the brewery scene?
They still don't have much of a tech scene or high impact industries. And the same calculus that has prevented a mass migration of tech companies to Boise or Waco is the same calculus that will prevent Amazon from moving there either.
My bet is Boulder; the Research Triangle; or Philly.
Boulder is almost as bad as the bay in terms of vested interests obstructing construction and development.
Denver or one of its suburbs would be a decent choice, but not Boulder.