Credit cards. Between earning rewards for travel you're already booking by using the right card, to sweet protections like trip cancellation insurance, to benefits like free TSA PreCheck and lounge access, it's amazing what credit cards can do if you know how to use them responsibly.
Get a body bag for your documents
Use a copy of your documents.
Do not keep money and documents together.
Do not carry large sums of cash.
Choose the best hotels to feel yourself comfortable in an unfamiliar area.
That's all my experience I get from 6 years of traveling worldwide.
I hope it helped you.
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Kudos - Put Your Cards to Work