Is the Casino open to the public? Like are you able to just stop in sms play without having to purchase for a room?

Yes

Yes it is open to the public. You can go in and play the slots and/or the tables and you do not have to stay at the hotel to do so.

Hello! Yes, anyone of legal gaming age is welcome to play. There is no other purchase necessary. Thank you.

Yes it's open to the public. You don't need a room.