Bring extra pens and a notepad. Laptop too if you have it. Don't be late, dress up unless they want you in street clothes. One time I had a rotation in the ghetto where we were supposed to distribute packages of syringes to heroin addicts, often going into their apartments. We were told by the site to not dress in a way that makes you look like law enforcement. Needless to say, I was carrying about 4 weapons during that rotation. One knife on the belt, one knife in the socks, a Walther P99 replica that shot out rubber balls, and a stun gun.
Try not to ask questions on rounds. Ask your preceptor before or after rounds. What I'd do sometimes is write down something I wanna mention to the docs on a notepad, pass it to my preceptor, and they'd nod if they want me to bring it up.