Ok, I'll admit I was not a business major, so I won't specifically advise a particular major. Plenty of others here that I know can do it better.
However, I went to a solid enough business ugrad, and I've known many many business major peers/friends. I'll cherry pick a few things that seemed to work out for those who had a very productive (and fruitful) biz undergrad experience.
--First, I'll say the smart-fuckers with 3.8's 3.9's 4.0's are not all insufferable, boring nitwits (though I met plenty of them too) . Some of the most interesting and fun-loving people I knew in undergrad were kicking ass both in and out of class.
--If you do more people-oriented work than cubicle jockey, I'd imagine knowing a language could be quite helpful. Many Americans lack this key skill (admittedly, I'm working on it myself). I had a good friend learn both Chinese and Portugese by first taking classes in undergrad then using his summers to take a paid internship or study abroad in the respective countries to cement the language skill. This lead to near fluency after talking day-in and out with the people there. I believe this will be quite favorable as he goes into management consulting and who knows what career path later. All while maintaining 4.0. Don't let a language scare yourself off, many others have done it before you.
--Make damn good use of your internships and network connections. This is a large part of your lifeblood. Make every summer count in some form.
--Apply for scholarships to train/study abroad, see how high you can reach.
--It seems that regionally respected business school did alright regionally. However, I still noticed those I knew in private (higher tier) pulling more offers nationwide than just their region. I'm sure this isn't a secret anyhow.
--When you take your Gen-Eds take things that kill two birds with one stone. Meaning, take things that you'll appreciate later in life, not some snoozefest meaningless class you heard was easy.
Examples that are likely Gen-Ed and have tangible lifetime benefit..
Language(s) (see above).
Calculus, will carry over in life more than you immediately think sitting in class. I believe this is a business requisite anyhow.
Physics, nuff said. But, if you ignore all other sciences and just take first semester you'll be better for it. It makes you appreciate the small things of how they work in life, the concepts carry over to so many things.
Public Speaking, who couldn't use more practice? Too many people suck at this skill.
Classics, not only are the stories entertaining, you'll find the references carry over to many odd places in life.
Psychology, and/or Interpersonal Comm. Study, helps you understand little better dynamics of human interaction/ thought. Especially true if you have a great prof.
The rest of the credits choose to be your own or to work towards another major/minor. Perhaps, throw in some history courses if you find the time. If no,t it's not the end of the world.
-- Finally, get laid often and with a variety of wimminz. Don't get 'em pregnant like an idiot. Let alcohol enhance your weekends, but don't make it a crutch. You'll probably have better luck that way.