There's a good section on Timber Point in William Quirin's new book "America's Linksland" (A century of Long Island Golf).
This club was private beyond belief and Quirin tells an interesting story about the Suffolk County Mosquito Commission asking Timber Point's membership for a contribution to fight the God awful mosquito problem in the area.
The club refused, "preferring to contend with the insects rather than the masses who would find the area far more attractive should the mosquitoes vanish. They didn't and the members played at times with mosquitoes all over their faces." (Ahh, the lengths and trials and tribulations one must go to to maintain true privacy!!).
Anyway, a 1,500 acre estate adjacent to the golf course came up for sale for $250,000 and the club snapped it up only for protection. However, their evil archrival Robert Moses also had his eye on that estate and although the club had bought it Moses had it taken from them by nefarious legislation and eminent domain and turned into the Heckscher State Park.
According to Quirin, as well as holes like Gibraltar, the 11th, known as the "three island" hole was one of the more unusual ones. It was similar in concept to Lido's #18, offering the player three separated fairways as a tee shot option. Unfortunately the "three island" hole did not survive the years but its green is now the green on the Blue nine's 1st hole.