We did this trip last spring. Side note, if looking at engineering, you’ll kick yourself if you don’t stop by Olin College. It is an amazing school and one many haven’t heard of. Parking at Tufts and MIT is super easy. Make time to visit the museum at MIT. We stayed in Waltham first night, got up and drove to Tufts, then checked into the Buckminster, walked to BU from there, drove to Northeastern and paid a lot to park by the art museum, so make time to go there too if you park there! Then stayed at the La Quinta to see MIT the next morning. Then visited Olin on the way out of town. Good luck!!