The most important things to the aspiring intern - at least in my experience - are punctuality and visible diligence.
Sucking up to the boss can work. It's not the only road, and perhaps not even the best road, but it's important to note a few other things as well before you ignore a high-powered job so you can flip burgers because you think the boss is more competent. Bosses come and go, and I've made my mistakes. I've ingratiated myself to my boss, only to have him leave the next month, and I've taken a position beneath my abilities and experience because I thought the boss was an all-star only to have her give her two weeks notice, leaving me without *any* boss and therefore without any opportunity to advance or stay on past the end of my contract. As an additional note, flipping burgers is a great way to get no respect from anyone while you waste away on a substandard salary.
Take the job if you want it. Not just because of a boss, or a location, or a salary range, or even what you think you want to do. These are all factors, and should be considered in tandem. In the event that you wind up with a lousy boss, by all means make the best of it and find the next opportunity to transfer to a different department or hop to another company. But if you love everything else about the job, don't let a boss like that keep you from where you want to be. You're going to have to learn to deal with pricks someday, and if you learn how early on you'll be ahead of the game.