Yes casual is normal
Yes, you can wear jeans. Some people dress up and some are a bit more casual. We are a boating community so that is the type of attire you see many patrons wearing.
The website doesn't specify, and I know I saw multiple patrons in jeans on my last visit. They might take issue if the jeans are full of holes or visibly tattered, but you should be fine.
Sure
Yes.
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