Book and travel Sept 1 to Dec 31 and get double points (RDMs). This is pretty good considering they don't normally give any bonus points, even to Premiers. This bonus period combined with the (semi)annual 1/2 price awards actually make the FFP worthwhile. Outside of these promotions the FFP is worthless. Info can be found here.
We've got 50 pts worth previously purchased, and so not eligible, but still need to need to purchase 3 short international r/ts during this period.