Buy a return ticket. Take enough money, better still traveler's cheques, to get you back if your return ticket becomes invalid. Check with your travel agent if you need visas. Health Find out about any special medical arrangements which exist with the rest of the EU and some other countries. But you should still take out full medical insurance.
Security Be security conscious.
Avoid unlit streets at night. Carry only the minimum amount of cash when moving about. It is normally safer not to resist violent theft. Remember, the laws and procedures which apply are those of the country you are in, not our laws. So find out something about local laws and customs and respect them.