the first time, Hole 1.
after many rounds, 1, 5, 7, 8, 11, 12, 13, 14, 16, 17, 18 all for different reasons as all have different ways to kick you in the nuts, or reward your effort.
11 is as good a par three anywhere
12 I never found it a challenge, and I never layed up
17 is my all time toughest par