Sean,
I think Seascale, in Cumbria, is a very underrated course with three terrific par fives, all vastly different.
The 6th has a left-to-right sloping fairway and green, the 7th is a great cross-bunkered hole, and 14 plays along a bumpy fairway next to the sea, finishing with a plateau green.
All three are probably the best holes.
Not sure many others will agree, but I thought Macrihanish's 10th and 12th might have been the best holes on the course - assuming you take 3 out of the occasion.