Id suggest taking the mbta or commuter rail to south station and then either walking from there, taking the Silver Line Bus #1 or #2 closeby and walking a couple minutes, or taking a quick 3-5 minute uber/lyft ride. As others mentioned, parking is very expensive.
There is a garage right across street 2min door to door.
There is a garage right next door. I have had my ticket validated at the ICA on a wknd, though not sure about week days.
Garage across the street I think was $15 after 5pm. Lots of restaurants nearby, you can make an evening of it.
Yes, vir is really expensive. Sometimes is cheaper to get a Lyft or a Uber
I would suggest taking the train or an uber
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