Is this all line dancing, can you just dance without a routine ?

You can do the line dancing are you can do your own dancing it doesn't matter.Their only rule is do not take your drinks out onto the dance floor

You are free to do whatever you like on the dance floor, but I would say if you aren't attempting to line dance.. you will be made a quick example of. People there take it seriously. They recommend that if you don't know how, they offer free dance lessons throughout the weekday. Thursday night is ladies night. Sometimes they'll play songs for beginners like cha-cha slide

I believe you can. But I have never seen it. But again I've only gone there on the weekends. The place is huge so if you don't feel like dancing in the middle you can easily dance to the side anyway you want :-)