Given that...
o Annual attendance is around 3,500,000 (per AB)
o The season is about 180 days (per CP)
That give an AVERAGE DAILY attendance of about 19,450 people.
Anybody who has been to the park on various days knows that the actual park population varies significantly between the busiest days and the least-busy days. Because many days are significantly less-busy than average, it follows that the crowded days must also be significantly busier than the 19,500 average. I'd say peak attendance in excess of 60k is not out of the question.
--Dave Althoff, Jr.