Yes you can, don't know about the drinking part but they have smoking areas by bathrooms
Yes once they stamp your hand as many times as you like..
There are smoking zones in the park and yes u can
Get the hand stamp on your way out.
Yes stamp your hand before you leave
Most people just smoke in the park...
There's an option for your hand to be stamped as you exit for re-entry. You just walk back up to the entrance and put your hand under the black light.
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