I don't remember seeing doors there. There's a gate but no doors to be close
I don't think there is any opening or closing time but I might be wrong
At the entrance there is a big blue panel saying "7:30 - Sunset" and "No Trespassing When Closed, violators are subject to arrest"
Water - sundown, facilities at 6PM, boardwork 24/7, Ocean Drive - lot of 5 AM.
I think it's allways open.
If you mean the surroundings and the things to do, this is a city that never sleeps, but I recommend you go before sunset
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