Hey there! I went to Summer Seminar last summer. There is no dance or anything dressy. That last dinner where families are invited is generally a free-for-all for dinner. You generally won't have any time to go on extra runs. Spend that time asking questions and hanging out with people in your...
Don't take my opinion as fact, as I am not an admissions officer. I would definitely retake the SAT if I was in your position. It never hurts to have a higher score. Also, some people do better with the ACT, so maybe give that a shot.