Here are some tips regarding your travel documents.
Make copies of all your travel documents, including passports, tickets, license, credit cards, etc. You can keep a copy of these in the cloud using a service like Dropbox or Google Drive. This will protect your information as you travel, yet allow you to access it when you need it.
Here’s another idea when writing credit card numbers…break up the numbers and call them something else.
You could call the first four numbers a password, the next three numbers a name, and the last numbers a phone number…or something like that. Whatever makes sense to you but not to someone else would work.