Hard to answer since your budget for gifts, meals, alcohol, etc is only known by you. My wife and I tried to pay for everything we could with cash in order to avoid the 3% conversion fee charged by Visa/our bank. For 5 days, we went through $420 but did charge 2 meals and our 1 mainland trip.
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Say it 5-times fast: "I buy my BBQ and Belikins on the beach at BCs!"