5. Continue to shut the fsck up but otherwise comply with lawful demands.
6. If you need to deny a request to search, clearly state that you do not consent to a search. Don't answer yes/no to the question because they might try to weasel word you.
7. Fight your battles in the court later with a lawyer if they do something wrong. Arguing on the street rarely works in your favor.
* https://www.aclu.org/know-your-rights/border-zone