1. Hyatt, if you have Hyatt Place stays when they have their (regular) stay-2-get-one-night free promo going on. Those redemption periods are limited, though, so be sure you can actually use those stays for something during the timeframe.

2. Tie: PC vs. Priceline rewards. Priority Club isn't going to get you much, but you can rack up the points (though they might be cracking down on this. I can't get 10K/stay. I think I get about 5K/stay.) Right now, they have a promo-after your second weekend (Fri or Sat night stay) you can get a $50 gift card to a store (your choice, includes Target and Amazon). PC elite rarely gets you anything if you stay at Holiday Inns.
Priceline rewards-just to remind you that the value hotwire and Priceline can outweigh traditional methods. Hotel points are a good deal in Europe and places where the dollar isn't strong. But you can get steals on Priceline...Look at the "with your money can you justify hotel status" thread in this forum for more.