Hyatt has a discount code for participants of the 'Chase' game. I wasn't targeted but the discount code has been made available and it gives you 15% off the Hyatt Daily Rate for most hotels I tried.
Just enter DISC15 in the correct spot on the Hyatt website.
Now Hyatt frequently has better priced 'sales' including their monthly 48 hour sales. The 15% does not apply to these prepaid rates.