As I have posted on other threads RE: PV, I have a book, given to my father by Eb Stienager, long time PV supt in '87 entitled Pine Valley, A Chronical. Dick, Mike Keiser, and Peter Senott had gone their to talk to Eb about the maint. aspects of PV when they were planning The Dunes Club.
About the trees, on pg 22 it states that a stabilization program was undertaken between '27 &'32 utilizing between 3k-5k seedlings (of which 70% flourished) "this furtehr advanced Crump's desire to keep each fairway a separate entity, lost from view of any other part of the course. The course is blessed as well with Dogwood, Azaleas, and Mountain Ash."
Jeff B. The book shows many early pictures of the site and it appears not to be entirely wooded but rather like something that was logged a while back and in the process of naturally revegitating. There's a photo of a hunting Crump from 1909 in an open area with a thin stan of tall pine behind but beyond those, one can see another open area.
About the bunker on 10, dad said Eb told him that it came about because of wear and tear. Evidently, balls would roll off the green and come to rest in that spot. Due to repeated pitch shot and foot taffic on/off the green, the turf wore out and was hard to re-establish. Eventually they gave in and allowed it to become a bunker.