Machrihanish -- front nine, which begins with three par 4s, has a short, almost target-like par 3 4th hole, then concludes with five straight par 4s of pretty remarkable variety.
Perhaps to counter such an odd nine, the course's back nine goes 5-3-5-4-4-3-3 before concluding with two fairly ordinary par 4s. The bakc-to-back par 3s on the back nine (holes 15 and 16) are the two best par 3s on the course.
Boat of Garten's wonderful back nine, with a bunch of quirky and challenging par 4s and a solitary par 3 (16th).
Golf House Club (Elie) has solitary par 3s on each nine!