No mentions so far for:
14th hole at Sand Hills - I made eagle there once, converting a 3-foot, steeply downhill putt from behind the hole. Only needed a 9-iron to reach the green, as my solid drive crested the hill and earned the power boost down to the far left side of the fairway.
16th hole at Shinnecock Hills - That lucky day I played this one, it seemed this hole had an ideal shape for strategic play. The number of bunkers is a bit off-putting, but if I could play this one at 475-500 yards, it seems ideal in many ways.
13th hole at Augusta National - still an exemplary risk/reward par 5.
9th hole at San Francisco - Great strategic design as well. Mostly, it's being on the 9th green that feels special. Like Augusta, the 9th and 18th green are set way back from the clubhouse, so it feels spacious and luxurious out there.
18th hole at Tara Iti - The par 5 finisher here is among the best holes on the course. If I recall correctly, the design is inspired by the Foxy at Dornoch. It has an elaborate and flexible green design for changing the hole difficulty. To balance things, I never figured this one out, struggling for bogey in all three tries.
However, after mulling it over, my favorite par 5 of all time is probably the 3rd at Pacific Dunes, the home state choice. I've played 20-30 times, and never tire of the challenges presented by the tee shot and the approach shot over the deep fronting bunker. Use plenty of club on the approach.