The best way to get around is by subway or car. Driving is the fastest way but finding parking in Cambridge can be difficult depending on where you are (esp if you are going to Harvard Square). If you don't want the hassles of finding a parking space & you don't want to waste money parking in a lot, take the T. Just $1 per ride. Not bad!
By car, bus or by the 'T' and personally I would take the T.
Finally ... a view of Cambridge and M.I.T. from the Harvard Bridge in Boston. Walked over on my lunch hour.
MBTA, bus, car or walk.
You can get here by taking the subway from Logan airport or you can drive. But if you want to arrive in style, have a boat drop you off at the Harvard Boat House on the Charles River.