Originally Posted by jameswes

Just be aware that you can't use the Club Lounge upgrades in conjunction with the free nights

Also keep in mind that in order to use the Club Lounge upgrade you have to call and book. You can check availability with rate code Z38.

Interestingly enough, sometimes that is LOWER than the otherwise-lowest price.

For example, 8/22-8/23 is 535/nt (regular rate), but only 425/nt with Z38.