At many of the “top” schools that attract a lot of CC attention, Greek life is understated (or non-existent). Exceptions include Duke, Dartmouth, Washington & Lee. At many other colleges, you can either take it or leave it. It’s there if you want it, but doesn’t dominate social activity if you don’t. So you don’t really need to decide in advance whether you want it or not (as long as you avoid colleges that don’t have it at all, which usually is indicated in the Common Data Set or US News entry).