About the law though, I think you should be aware that it isn't for everyone. Talk to lawyers in your family and ask them to be blunt. Most of what you do isn't going to be glamorous or exciting, and if you don't enjoy writing, it can be rough.
Get a practice LSAT book and try out the Logical Reasoning and Reading Comprehension sections of the test. They give you at least some idea of the logical skills you'll be using, and if you don't care for it, proceed cautiously.
Also, for the OP, read through the UCC (Contracts), articles about easements, negligence, and tax code. You can see stuff like this in print in law school study aids such as Gilberts or Emanuel. If this interests you, then the law may be for you. If you like the action of TV shows like JAG, the quips of Judge Judy, or the flash of Boston Legal, then you will HATE the law as the former list is the majority of what law school will be like. Lots of reading and writing and most of it very dry. And like the job market in general, the more dry and boring, the higher the pay. The LSAT can show if you have logical reasoning, which actually helps in seeing how there is almost no logic in the law. Learn to think logically, find out what areas of the brain they are, and then bury them for three years. What seems logical or fair, if that steers your moral compass, stay far away from law school.
In the MBA arena, MBAs who work in Hollywood or as sports agents generally make the smallest salaries (unless you are one of the very few big ones), but MBAs who have their specialization in taxation, accounting, or operations management (the dry and boring ones) have a much higher than normal MBA salary.
But if you want to make a difference for mankind, you can enter the ranks of MBAs or lawyers and be the head of a soup kitchen, local environmental action group, or legal aid. This usually won't give you a lot of money, but for having a piece of paper with the letters JD or MBA on it, you will make the most difference in society and make a real mark in the world. One MBA alumni outlined in the school paper was a big shot in finance, but then made a change for a lower paying, more socially satisfying job where he could help others. He came to the realization that he could make a million a year, die early in his 50s, and all that he would be remembered for would be one line on his tombstone: "and he worked very, very hard".