AGArgent: 590 yard par fours?! Serious? Gulp.
OK, I exaggerated on the par 4s, so in the interest of accuracy (sometimes a rare commodity, myself included :-o) I did a quick survey. Here are the 7 longest par 4s at the legend tier: #15, Oak - 499 yds; #12, BPB - 504; #11 CCC - 507; #10 BPB - 508; #17 SA - 515; #18 CCC - 520 (plays downhill); and the longest: #7 BPB - 525 yds.
Because of persistent strong winds on SA, 17 gets my vote as the most difficult par 4 at the legend tier.
My apologies for the previous misstatement.