I wrote an article summarizing my experiences teaching Linguistics to high school students, and it was published in the "Teaching Linguistics" section of Language in December 2014.
Abstract:
This
 article details a high school English teacher’s experiences teaching a 
semester-long elective course on linguistics to tenth, eleventh, and 
twelfth grade students in Milwaukee, Wisconsin. Students explore units 
covering an introduction to linguistics, phonetics, morphology, language
 acquisition, sociolinguistics, and the history of English. The article 
reviews related primary and secondary school projects that have been 
done in the United States and abroad, the curriculum of this specific 
survey course, successes and challenges encountered while teaching, and 
recommended resources relevant to secondary school students and their 
teachers.
High School Linguistics: A Secondary School Elective Course