I currently have 40 nights all earned in 2015 (i.e. no rollover nights), with 6 more nights booked in December for a total of 46. I will likely stay between 50 and 60 nights in 2016. I can't predict what my travel habits will be in 2017. Should I book 4 more nights this year to reach Gold? Or take the 36 rollover nights into 2016 to get to platinum sooner in 2016? If I open a Marriott Rewards CC to get the 15 bonus nights, should I do that this year or next?