- update your will or create one so that a guardian for minor children is listed. Without one, the courts would decide;
- create a health care authorization for your children -- if you are away, who has permission to get the medical attention if needed;
- create a list of important names, numbers, and accounts -- doctor, health insurance company, hospital your family uses, how to reach you on vacation;
- and make sure people can access said documents.
I have yet to travel sans children, but when I do, this information will be useful.