How crowded is the park on Sundays, what time is best to arrive with the least crowding.

I would imagine it is pretty crowded on weekends because a lot of people have parties. I would either go early in the morning, or late afternoon

Very crowded, the earlier the better (before 10)

Before noon or evening but at times it could be unpredictable

It is very hit and miss but usually crowded all day.

Its usually always crowded