Don't carry huge amounts of cash. Our police will steal it from you saying they think it was ill-gotten and you have to go to court to get it back. It's called civil forfeit.

Turn off biometrics. You can be compelled to submit a fingerprint or pose for a camera. You can't be compelled to reveal something you know (self-incrimination). Though that hasn't stopped at least one judge from keeping someone indefinitely detained.

For the most part, our country isn't a nightmare. But it can become one very easily under certain conditions. This is the rare outcome you hope to avoid that realistically won't occur for most visitors.