Day one, he had his doubts, because he hadn't gotten any work done.
Day two, he said, "well, socially I think this will be fine, but I'm not so sure about academically." He was anxious about already being behind because of computer issues. (No wireless access in the temporary building makes it tough to do online school.) That evening we talked to his US History teacher, who suggested that he start history and math after Labor Day, and the academic pressure relaxed.
Day three, yesterday, massive confusion about pick-up location amidst a torrential downpour, but when he finally made it home, he said, "I had a really fun day today." YAY!