Ugh, I will be needing to get from Revere Beach to Harvard Square, so Blue/Orange/Red was the plan. Perhaps Blue/Green/Red is better?

I'd really prefer to avoid a ride share or rental car.

Edit - it appears that it's less than a 10 minute walk from Govt Center (blue) to Park St (red). That's better than waiting for a train and taking for a single stop, right?