How big are fraternities in the Hamilton social scene? Are they the main venue of socialization for most students? Are most parties open only to members and pretty female guests or open to all? If frat parties are not your thing, will you be part of a small minority or are there many students who do not participate?
As you await a fuller reply –
Male students in fraternities: 27%
Female students in sororities: 20%
Structure: Nonresidential organizations
Hamilton’s Greek life is unique–it’s there if you want it, but by no means, is it ‘required’ or pervasive. Frats and sororities (along with team sports, clubs/organizations) all throw parties in various “social spaces” around campus. While occasionally these organizations will hold a private, invite-only event, most parties are “all-campus,” meaning everyone is welcome to come! The fraternities/sororities host theme parties every year, such as the Beach Party, Wet Hot American Summer, The Farm Party, the 70s Party, etc. All of these events are open to the entire campus and routinely attract several hundred students. If you want to be involved in Greek life then it is available, otherwise you can just enjoy the benefits (i.e. attend the parties). I am not a member of Greek life and my social life is doing just fine 
I second what abc1230 said. My D is at Hamilton and chose it because of the low profile greek system and the inclusiveness of the culture there. She is involved in a few particular clubs who act as a strong social group as well. There is plenty to do and plenty of parties if you want to go that route. She has never felt lacking in any social capacity and did not join a sorority.
Bump
You received a very complete and timely answer to the questions in your first post, and there was also a timely confirming post. Why are you bumping? Do you want to know if the situation is the same 16 months later? Do you have additional questions, or are you looking for more comprehensive answers? Simply posting “bump” is not at all helpful.
Seeking a larger number of opinions. I appreciate any experiences anyone is willing to relate. Thanks to merc, abc and barnacle for your help!
I’d say that with options such as REAL (a program in which some first-years live and take classes together) and the popular substance-free and wellness dorms, combined with the nonresidential aspect of the fraternities themselves, the living/intellectual/social elements of a Hamilton education will be largely under an individual student’s control. Stated differently, the basic supporting structure of Hamilton life seems to have diversified well beyond the influence of any particular socially-similar group.
That seems like a very helpful response, Merc81. thanks