I don't know about oct. But I'll share my experience this summer. We were there several times the first week ofvjuly...including July 3 and 4. I was pleasantly surprised at how much we were able to do we did all the popular slides before 11 then enjoyed the wave pools lazy river and rapids in the afternoon. We never felt it was wall to wall people. Busy yes..but still very enjoyable.
I would imagine oct. crowds are very light and you'll have little to no waits for anything.