What are they? Here's my list:
1. 13 Lawsonia - An exciting tee shot, a decision on the second shot with about 4 options and no right answer, and an excellent green with plenty of surrounding trouble. It's a borderline perfect hole in my book.
2. 6 Pebble Beach - Without a doubt, the most intimidating second shot on a par 5 that I've seen.
3. 16 Blackwolf Run River - Pete Dye at his swashbuckling finest and a setting that can't be beat.
4. 8 Crystal Downs - What's the best hole in the world that climbs more than 30 feet in elevation? This has to be a contender.
5. 7 Beverly Country Club - My favorite tee shot on any Ross course.
6. 5 Pete Dye GC - The one downside to Pete Dye's par 5s is that it's downright depressing to layup and miss the excitement of his high-risk high-reward second shot. This might be the most thrilling par 5 I know of to take a rip at reaching in two.
7. 16 Whistling Straits - A brilliant blend of subtlety and audacity.
8. 16 Colorado GC - The best "channel hole" I've played.
9. 10 Wolf Run - Width, risk/reward, and a final 100 yards that invites a player going for it in two to run one onto the surface while demanding perfect distance control from the player approaching with a wedge.
10. 9 Canterbury - On a layout that tests every shot in the non-professional's arsenal, the 9th green demands either immaculate distance control, superhuman putting, or the widest variety of short-game scenarios on the course.
Honorable Mention:
4 Kincaid Lake - One of the most original holes I've ever played. Back before Ballyhack and Kinloch, Lester George worked on this 9 holer as part of the Kentucky State Parks system. For $7.50, it's worth a visit. More here:
http://www.golfclubatlas.com/forum/index.php/topic,58913.msg1384099.html#msg13840996 Kampen Course - Nobody builds par 5s better than Pete Dye in my opinion. This could easily have made my top 10.
18 Pebble Beach - It's gorgeous and iconic, but maybe just a smidge too narrow of an overall corridor with the ocean left and OB right. Still, it might be my favorite tee shot in the world if it didn't mean the round was about to end.
17 Clovernook - A homer pick from my former home course. I'm a sucker for a hell's half acre-style hazard on the second shot, and the pond/Tay Baker Tree here fits the bill but with a bit more severity than the standard bunker.