Do this now: Marriott summer promotion

Throughout the year, Marriott Rewards runs promotions whereby you can earn free night certificates after completing a specified number of paid stays. Marriott's previous Megabonus promotion ends today, which means it's time to register for the summer free night promotion.  

This summer you can earn up to 2 free night certificates, good for any Category 1-5 Marriott property.  You'll earn one free night certificate after 2 paid stays between May 15 and September 2, then another free night certificate after another 2 paid stays in the same period.

Sign into your Marriott Rewards account, then click here to register for the promotion.

Meanwhile, make sure you're registered for these other hotel promotions: