Ir os open from 8 pm till 2 am?

Yes

We are currently open 11AM-11PM, with the last elevator going up at 10:15PM.

Yes, but the last elevator goes up at 1.15am

Plastic

Yes It's open 11 a.m. - 11 p.m. and the last elevator goes up at 10.15

Yes it is!!!

now, it's open Sun - Sat 12:00 PM - 9:00 PM

The time there open is Friday 10AM–10PM Saturday 10AM–10PM Sunday 10AM–10PM Monday (Martin Luther King Jr. Day) 10AM–10PM Hours might differ Tuesday 10AM–10PM Wednesday 10AM–10PM Thursday 10AM–10PM

And

Hello! Kids younger than 6 years old have free entrance?

Yes. Best views at nigth.