Again, probably smaller than you might like, but New College of Florida (a public honors college) is in Sarasota (hardly an urban metropolis, but there’s probably a decent amount going on.)
Most of the schools I can think of are either suburban (e.g., Sarah Lawrence, Bard, Skidmore) or rural (Bennington, Hamilton), or not on the east coast (Oberlin, Reed).
If you have Ivy League aspirations (and the stats to support it, Brown would probably be the hippiest pick of the lot)
Some of the women’s colleges are hippier than others.