Blasphemy...all of you...
All are bastions of bluebloodedness...
Kittansett is well-known as a Flynn course and top 100 layout. I have only played it once, and it is a very natural and old-school. Holes 1-3, 16-18 are in view of the ocean, with #3 playing over it to an incredibly unique island green in the beach sand. Hole 4 brings you into the coastal forest, and you do not emerge until #16. Bunkers are natural, with fescued-edges, and approach shots are to smallish greens that alternate between flat and severely-sloped. When the wind is up, a very tough test at about 6600-6700 yards.
I have not played Hyannisport or Sankaty, but here is what I know....
Hyannisport is well known in Mass. golf for three things, the Kennedys, the Seagulls tournament in November (I think), a fourball played in all manners of awful weather, think Bandon in Jan-March, and as an oft-host of the Cape Cod Amateur. It plays along the ocean, much of it in tidal marsh form.
Sankaty is a very natural course located on Nantucket. It is named for Sankaty Head, the part of the island it's on, including the lighthouse of the same name nearby. It was designed by Skip Wogan (the architect of my home course of Tedesco, and the pro at Essex CC after D. Ross). Apparently it plays through a very links-like landscape, with gorse (probably not the actual stuff) and long grass throughout. The course is also wide open and VERY affected by the wind. Apparently the course is accessible off-season (outside of June 1-Oct. 1) to non-members with a tee-time call, which is something I will have to do one of these days.
For comparison with other courses I have played, I put Kittansett on about an equal level with Myopia and Essex, with TCC, Brae Burn, Winchester, and CR a half-step below, and Tedesco, Woodland, Plymouth, etc. a half step below those....
-Brad