If you are a US citizen and your travel plans this summer include Canada, Mexico, Bermuda or the Caribbean; new rules took effect at the beginning of the month that now require you to have a passport or an ID off a short list of approved IDs to reenter the US from those countries. In the past, travelers could use identification like a birth certificate and a drivers license to leave and reenter the US from those countries. But thanks to the new Western Hemisphere Travel Intiative, the requirements are now stricter. The US government has set up a website that explains the new rules in more detail at getyouhome.gov.
In any case, if your travel plans have you leaving your home country, it’s always a good idea to double-check things like visa requirments to make sure that you have all the documents you need. The IATA has an online travel centre set up where you can go enter in your travel information and it will tell you if you need any visas or not while you’re traveling. You can also find out information like customs regulations and airport details.