Thanks again for some great info.
I just got back from the Counselor's office at son's high school. It seems like S needs to take three more classes as a senior to graduate on the distinguished graduation plan, next year. They normally take seven courses each year at his school, so he will have a lot of free time in senior year. In addition, the three courses that he needs are not very demanding, Physical ed., Government and Spanish III.
Any suggestions on what he should do with the extra time? He could obviously use some of it on writing essays and preparing for the SAT in October. He could also use the extra time to shore up his ECs or do an internship and fill in other deficiencies in his ECs. Sorry to bother you guys with this again.