I think expansion of the Peace Corps and financing of opposition groups is a bad idea. American financing in many countries would guarantee an end to many a groups credibilty. American intentions are looked on with suspicion because of our policies and track record in places like the Middle East and Latin America. Rather then intervening in other nations internal politics better we implement reform of our own economic and foreign policies.
I would also always be leary of armed intervention (although I supported the armed intervention in Bosnia and Afghanistan). I think we should do it when we can be sure it is doable and the unintended consequenses can be minimized, which is to say -not very often.