What is the author's tone in Driving to Town Late to Mail a Letter by Robert Bly?

In "Driving to Town Late to Mail a Letter," Bly's tone is one of contentment through his description of a deserted city street scene, the simple action of mailing a letter, the "privacy" of his solitude, and the desire to prolong the experience, expressed in the line, "Driving around, I will waste more time."