First Day Activity using Post-It Notes. What are your goals for this year? How will you reach these goals? What can (the teacher) do to help you this year? This could be adapted for high school students.
The students' "homework" for the first day of school is to fill up a brown paper bag with 5 or 6 things that are important to them. Over the next several days, they take turns sharing their bags with the class and talking a bit about themselves.