I agree with Daryl. Shoot with and without the polarizer and see what works best. Since you will be shooting with a digital camera, you have nothing to loose. You certainly won't be wasting any film and flash cards are getting cheaper and cheaper. Keep in mind, when you have a great subject in front of you, shoot it as many ways as possible. Especially when it is a location you may never return to.
Have a great trip!
(photo tips and more)