Research shows that wearing your mask, and opening the front passenger window, and the window behind the driver seat helps to reduce the spread of the novel coronavirus in your vehicle. See this NY Times article.
I arrive at Logan airport in Boston at 4.30 PM on Thursday 30th May and I need to find a car ride to go to Provincetown that evening. I do not have any specific time to arrive really, and I can wait for a few hours at the airport.