Book between May 13, 2011 and August 22, 2011 and stay at participating hotels within the Hilton Worldwide portfolio between May 27, 2011 and September 5, 2011. Some hotels may extend offer period. Subject to availability. Full non-refundable prepayment required at time of booking. Your credit card will be charged immediately for the total amount quoted for the entire stay as reserved and refunds or credits will not be issued unless otherwise indicated by local law. Must book at least fourteen (14) days in advance of arrival. Discounts vary and range from 15% - 40% off select rates based upon days of the week a stay is consumed, geographical location of hotel and/or by brand. Blackout dates and length of stay restrictions may apply. Additional terms and restrictions apply. See website for terms and conditions.