Club Carlson just launched a triple miles promo from 6 April to 28 June. You must register in advance at this address. There is also a bonus 1,000 points if you book via their mobile app after you have registered.
Terms and Conditions:
You must be a Club Carlson member to participate in the “Triple Points Time” promotion (“Promotion”). Promotion is valid for Eligible Stays, as defined in the Club Carlson Terms and Conditions, between April 6, 2015 and June 28, 2015 (“Promotion Period”). To earn 40 bonus Gold Points per US. Dollar spent on Eligible Stays in addition to the 20 standard Gold Points per U.S. Dollar spent on Eligible Stays (“Triple Points”), you must register online for the Promotion atclubcarlson.com/triple and provide your Club Carlson member number at the time of reservation or at check-in. Once registered, you will earn Triple Points on Eligible Stays at Quorvus Collection, Radisson Blu®, Radisson®, Park Plaza®, Park Inn® by Radisson and Country Inns & Suites By CarlsonSM hotels worldwide during the Promotion Period. In addition to Triple Points, once you are registered you will earn 1,000 bonus points for Eligible Stays booked on the Club Carlson mobile app. Stays or nights paid for by redeeming points or by using Points + Cash are not eligible for this Promotion. You only need to register once, but you must register before checkout of the Eligible Stay to earn Triple Points for that stay.