What do you think about chilling in a car during the day with a girl you've already made out with?

I don't have much time, the weather won't be great, and there's nothing to do beside going to the same park we went on last date where we made out. Both of us live with parents.

Is this too low effort? The objective for tomorrow is getting sexual in the car in a parking lot.

Should we go for a walk before car escalation?