Back in March I reported on Hilton's Quarter 2 promotion, which offers 2,000 bonus HHonors points for weekend nights during paid stays and 1,000 bonus points for weekday nights during paid stays (register for that promotion here, in case you forgot). Also be sure to check out my post on two unrelated Hilton promotions offering bonus airline miles for stays of 2 or more nights.
Registration is now open for Starwood's Spring promotion, which offers double Starpoints on paid stays between May 1 and July 31 at participating properties. Additionally, you get 500 bonus Starpoints on all bookings made using the Starwood Apple or Android apps, or using Starwood's mobile site.
The long list of non-participating properties includes the Westin Portland, where I was actually considering making a paid reservation this summer. That's too bad, since the property looks really nice, but I don't support excluding properties from quarterly promotions, which have gotten stingier as it is. The lesson is, always check whether a property you're considering is on the list of non-participating properties to avoid an unpleasant surprise when your points post (or don't!), since there might be a suitable property nearby which is participating.
At any rate, even if you don't have any paid Starwood stays planned, you should register now, before you forget.