Hilton just announced a new promotion where you can earn double or triple points on all stays between May 1 and August 31, 2017. Every member is eligible for double stays and those with Hilton Diamond status will earn the triple points. To earn the bonus points, you must register for the promotion PRIOR to checking out of your hotel. To make things easy, you might as well just register now.
Fortunately, almost every single hotel is eligible to earn double/triple points. The only exclusions are Hampton hotels in Mainland China.
Enjoy your bonus points!