Steve:
The 6th hole reads 377 yards on the card, however, if measured directly it is closer to 320 yards. It is an exciting hole that probably sees more bogeys and doubles than birdies. It is reachable with a helping wind. The green is among the most heavily contoured on the course which I think fits a driveable par 4. More players would probably play down the right side if the fairway were wider and more visible from the tee. Almost everyone seems to play driver at the green.
The 15th hole is 333 yards from the tips with a huge fairway and a large, fairly flat green, and a shallow, right fronting greenside bunker (that doesn't appear on the below diagram). I think the intent was to make this a breather hole as it comes after a tough 450 yard par 4, and precedes a tough finish that includes a 207 yard par 3 and two more 450+ yard par 4s.