Yes
They don't always check for reservations but if they are checking, and you don't have a reservation, then you will not be allowed in. It's really quick and easy to make a reservation online so I would recommend that you do.
Yes you will need to do that.
We had to
Get tickets online is your best bet
Yes you need to make a reservation on the site
yes, you need to make a reservation during the pandemic.
When I went I didn't make any reservations.
I highly recommend it.
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