When you arrive at the jail, be prepared for a security check that's more thorough than a TSA screening at the airport. You'll need to bring a valid ID and proof of relationship to the inmate, or you won't be allowed to enter the premises. And trust me, you don't want to get on the wrong side of the jail authorities.
The visitation rules are pretty strict, so make sure you follow them to the letter. No cell phones, no food or drinks, and no contraband (obviously!). You'll also need to dress modestly, which means no revealing clothing or gang attire.