My vote for the second hardest hole is BPB #7 when the pin is tucked front right behind the sand trap. There is no trick to get it close there and you have to rely on making a 40 to 50 foot putt. #5 is tough but there is a trick or 2 to get close on this green.
#3 would be Kia 4. Tricky shot but it can be had.
#4 would be Kia 5. Again birdie is out there but totally dependent on drawing a headwind or a side wind from 9:00 to 3:00
#5 would be STA 17. This hole is tough but birdie is there with a couple of good shots whether you have a tailwind or a headwind. Crucial to hit the fairway but if you do it's a green light. Tailwind leaves about 130 - 160 in if you thread needle and can hold the green very easily. Headwind is great unless you draw a 30 mph in the face and have to play right of the bunker and sink a 30 footer. I've played this hole about 12 times now with 5 birdies and only one bogey.
****Disclaimer- The rankings described are with Ping Master Irons and GI SD balls which generate a ton of spin and make stopping the ball close much easier.