In addition to the preview option they do have a ticket called sunset ...its either 4 or 5 hours depending upon closing time.
I bought my tickets through AAA and inaddition to general admission to the park there was something called Preview Passes included. You could go into the park either 2 or 3 hrs early depending on the closing hrs the day before you go in for general admission. If the park closes at 11pm I think you could go in 3 hrs before it closed.
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