My 11-month old is an absolute saint when we're out and about, then a horrifying tornado of destruction when he's at home. I suspect a lot of it is just boredom, but its hard to tell because... 11-mo olds aren't great at verbalizing their discontent.
As he gets older and he starts losing that starstruck look of wonderment at the mall or a new restaurant or wherever, I suspect he'll be harder to control. But he's also incredibly clever, athletic, and curious. I don't want to discourage any of this just to make parenting a bit easier in the short term.
Can't fucking imagine actually hitting him. I know what that did to me after the rare few times my mom did it. I still can't bring myself to forgive her 30 years later. And there's no way I want my son thinking of me that way.