You can get 18 AA miles/$ at Restaurant.com by buying GCs at 90% off!
Starwood has a new promotion for Q1 (Jan. 9-Apr. that offers 2x and 3x points for two- and three-night stays respectively.
You can still get $5 of TripAlertz credit for every person that you invite. You can join with my link or use one of the links in the comments.
30,000 Delta Miles No First Year Fee