Apply for passports at the post office. Every U.S. citizen, including infants, needs a passport. Obtain passports several months in advance because processing takes six to eight weeks. If you have a passport, check that it is valid.
Reserve plane tickets with seats next to one another. Book hotel and transportation to and from the airport. Reserve private transportation for any sightseeing if you do not want to ride the public buses, take taxi cabs or catch trains.
Prepare children for the trip by showing them pictures of sites and the hotel. Talk about the language, food, music and people. Outline rules for safety and behavior.
Pack clothing changes for children. Stuff a carry on bag with toys, books, a first aid kit, snacks and drinks. Pack an umbrella stroller for younger children. Ensure passports, plane tickets, itineraries and money are accessible.
Check-in and print boarding passes at home on the Internet. This will make airport arrival and check-in faster. Confirm hotel reservation and transportation.
Take children to the restroom, or change diapers, prior to arriving at the gate. Families with younger children board first, so arriving early will allow children to acclimate to the plane.
Show your child the other planes out the window and introduce them to flight attendants. Knowing what will happen and who is there comforts children. Situate your child with snacks and entertainment. Encourage children to nap during the flight because adjusting to the time change will be difficult.
Pack belongings when the plane begins its decent. Prepare children for what will happen next. Familiarize yourself with what is next on the itinerary, too.
Settle in to your hotel and let children rest. Discuss safety rules.
Ask the concierge what family friendly restaurants, shops and sites are in the area and what packages are offered.
Exchange your American dollars for Euros --- European currency --- at the bank.
Visit attractions such as castles, architectural sites, museums, beaches and parks. Eat local cuisine such as tapas. Talk with your children about their experiences.