I would add a read the bills provision, which would require the full text of any law proposed before congress to be read in it's entirety on the floor before it is passed. Any modifications to the law would require re-reading from the start.
I would craft an amendment for the default expectation of privacy. The US Postal mail is given many privacy expectations that other forms of communication aren't.
I would love an amendment stating that you own your body and the government shall pass no law regulating it (drug use, who I hire as a doctor, who I chose to lease my body or body parts too). I don't think this would be met with wide support and I can't figure out a way to succinctly word it.