I love this one either way. You can fly out, spend some time on the beach, then red-eye home. You can slum it in coach and hope for upgrade or go ahead and fork over the fee for a 1st class ride as 8CPM is tolerable. Here are the coach numbers:
8,102MQMs at 4.5CPM
Bookable on Delta.com – route via JFK for best CPM
DM yields a VERY tasty 18,230 Skymiles per CWSI.net!
PS – If you find yourself w/in a few hundred miles of PDX there are some even BETTER deals in both coach and in 1st class so be sure to search surrounding airports to PDX!
EDIT: Looks like SFO or LAX to SJU is WIDE WIDE WIDE open at 4.2CPM also!