By mid September Halloween time will have started, and by mid November Christmas time will have started. Both holidays bring in lots of people, and will be very similar crowd wise. It will be good during the week morning and afternoon, but expect it to be very busy in the evenings and especially weekends as locals swarm the parks to enjoy the new seasons, and to see the new offerings. weather wise expect September to be very hot, even in the evenings. November is still warm, shorts during the day, early mornings might require a bit of layering. Evenings cool down quite a bit so bring a hoodie. I think it really just depends which holiday you would like to see more.