Summer vacation plans? If you're booking a hotel, check out this coupon offer from Orbitz.com -- you'll save an extra 15% off their best hotel deals with the coupon code SUNFUN15.This coupon can be used on stays booked by May 26 and completed by July 31, 2013 on hotel stays of one or more nights (vacation packages are not eligible). Valid at participating hotels only and rules, restrictions, and black-out dates may vary by property. For more information, or to book your hotel stay, visit Orbitz.com by May 26.