A passport it the safest and most efficient documents for travel in today's world. It has become a standard requirement for those wishing to travel outside of their own country, each individual - even a newborn baby must now carry his or her own passport.
Whether you travel regularly or only once a year it is important for you to become familiar with the passport regulations of the country you intend to visit. Some countries require your passport to be valid for at least 90 days from the time you travel while other countries require it to be valid for as long as six months. The length of time varies from country to country so it is vital that you check the country's requirements and make sure your passport meets these requirements. These rules are in place in order to ensure a visitor who unexpectedly needs to stay for a period longer than originally planned (say for medical reasons) still has a valid passport to leave the country. You can find this info available at www.voyage.gc.ca. Other requirements when you are entering a country that is not you own is to have the name and address of your resort handy, some countries routinely ask for this so it's good to be prepared.
Also it's important to check out the condition of your passport. Check to see how many passport pages you have left - you may need a certain number of blank pages available to be allowed into certain countries. If there is any significant damage to your passport such as pages missing, pages torn, unofficial markings on the data page. water damage, a hole punch, or other injuries you could very well be denied boarding. Normal wear and tear is acceptable however if you have any of these issues with your passport I wouldn't even try travelling until you get a new passport. Keep in mind if you are denied boarding you will not only lose out on your vacation but you will lose financially as well because travel insurance will not cover this type of incident.