As someone who just completed a senior thesis, it's a long, hard road, with much gratification at the end. When I look at my book (it became a book; it's no longer a thesis), I am so proud.
Doing a thesis on Greek leadership sounds really good. You could possibly do it on changing attitudes towards Greek Life (my friend just did a similar thesis on homelessness, and basically gave her controls a neutral essay about homelessness, and the experimental groups a persuasive essay about the homeless situation; and surveyed each group before and after they read the essay.) Depending on the pro/anti-Greek attitudes of your campus, that could be something that had an impact on your university long after you have left.
Best of luck with everything!
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