Back to school idea - "We're looking back on summer, this is what we see!" Have students draw pictures of things they have done over summer break in sunglasses. You could also do it for things students are looking forward to this year.
End of School May. Twist this and have your teachers write this for themselves. Edit the questions to reflect your goals for your school year! Fun first day activity: Have kids write a letter to themselves at the end of the year.