It may sound simple but here are a few things a lot of people don’t pay enough attention to when traveling to a different country. Being in a new environment , especially females traveling alone, should always be aware of their surroundings. For example, taking drinks from a stranger or drinking too much at a bar may lead to dangerous situations.

Other general ideas may be checking your seat when leaving any place to make sure you haven’t left anything (try to consolidate when carrying multiple bags).
Make sure to keep your passports, laptops or any other items like this somewhere safe people won’t/can’t reach.
Don’t show large amounts of cash in unsecured areas like isolated or dimly lit locations, especially at night.

Try to blend in with locals by dressing appropriately. This will also make you less of a target for those looking for obvious tourists.
Also try to not mock cultures when sight seeing as it may offend the people who live there.
Be safe and don’t forget to have fun!
Feel free to add your own do’s and don’ts to this list 🙂