<p>How about BRANDEIS?!</p>
<p>We have an active equestrian club. It's very active; there are nearly 100 people on its mailing list. See <a href="http://people.brandeis.edu/%7Ebec/%5B/url%5D">http://people.brandeis.edu/~bec/</a></p>
<p>It meets your size requirement, and, needless to say, has a very large Jewish community. </p>
<p>When I think quirky- I think Brandeis. Brandeis is the best fit.</p>