Avoid milk if there is any question whether it has not been pasteurized. Be selective in what you choose to eat. Water quality, lack of proper cooking, and general handling are concerns that warrant a general rule of no shellfish or raw fish. Take an appropriate supply of medication in its original container and a copy of your prescriptions, including eye wear. When a parent and child are traveling together, many countries now require that the parent present a signed letter of travel consent to enter the country from the non-present parent.
Some countries consider over the limit on credit cards a felony offense that can result in jail.
Do not take anything that you can not afford to lose. Don't leave valuables in your lodging area. Enter your money pouch once a day. Take the amount of money you will need that day and leave the rest in the pouch. Wear a swim suit in open water, pools, saunas, and hot tubs.