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.
Will be driving to Yosemite Ntl Park with a car rental on October 6th. My flight arrives at 10:30pm, I will pick-up the car and I am pretty flexible after that. Can pick up, can spend the night in San Francisco and leave early the next morning (Oct. 7). I'll pay the car entrance fee to the National Park. Simply looking for someone to join for the 4hr-ride and share some of the cost to get there. Return date is October 15 or 16. Flexible.