I’d say Tufts or Harvard. Can you do an overnight visit at each, go to a class, etc? That might enable you to see beyond the stereotypes.
Tufts is great for IR and is very committed to the idea of global citizenship.
FWIW, my daughter vastly preferred Tufts over Harvard when we visited. If you do choose Tufts, it’s not as though you’re slumming.
However, Harvard is Harvard. Sorry! 