The only time I took a newbie with me to a casino, I ended up regretting it.
The guys worked with me and somehow he heard that I was going to a casino on the weekend, so he asked me to take him. He's never been to a casino in his entire life and wanted to see how it is. I warned him that I was going to play a tournament, during which he won't have anyting to do but getting bored. He still insisted.
At one of the breaks, around midnight, he started nagging me about going home. After getting nocked out (FT), I wanted to hang out a bit, maybe play some blackjack, but he was like a little kid, complaining that it was very late and that we had to leave (About 2 hours drive).
I had made a little money, just double my buy in and couldn't cope with his whining, so we left.