Have either seen first hand or have seen good video/pics and these seem to be the nicer ones and they tend to go along with the success of each program. In no particular order:
Johns Hopkins
Wash U
Emory
Pomona
Trinity U in S.A., TX
UT - Tyler...actually pretty unbelievable
NYU plays on a very nice minor league field on Coney Island. But seems like quite a hassle to get to from campus and I wonder if anyone comes out to watch.
As nice as they are, they don't compare to most D1 facilities. Also, I'd be interested in crowd turnout info at D3s. Do students and others come out in decent numbers to support? In playoff games at 6A Texas HS baseball games, we routinely get hundreds showing up so am wondering how much of a drop off we're looking at if our son goes to a D3 in terms of fan base/excitement. Would love to hear from someone with direct experience.