The rest of the day went a little better. Although my son did not enjoy his first day, he got through it. He came home saying he had a bad day. To quote him "recess was too short - they kept blowing that whistle. Line up, then go play, line up, then go play, then line up and go inside, no fair". Plus they had some writing assignments to do and he was unable to complete them (he can't focus long enough to come up with a story and write it).
Luckily, we were able to change his bad day to a good day by going out for ice cream after dinner. It was a long standing traditional in my family to go to the local ice cream parlor after first day of school, report cards, dance recitals, etc. and I think it is a nice one to continue. It always put a smile on my face when I was younger and it worked for my son as well - he walked out of the ice cream place saying that ice cream was a great reward for a good day.