Its really going to come down to exchange rate on the day / what fees that your going to be charged to exchange currency. Would be best to do some research online of current rates in different locations / whats the outlet or banks will charge you.

$700 is a lot of cash to be carrying around in one hit, are you planning to pay for everything with cash? All major retailers take credit cards, depending on your banks fees it could workout cheaper as well. Example of a 3 day weekend I'm lucky if I used $50 cash in Sydney, yet might say put $300 on my visa.