Don't ride in rush hour traffic while clipped in if you've never ridden clipped in before.
Look around and enjoy the scenery - you don't get to do that while driving a car. Smell the air (the manure in the country will clear your sinuses), moo back at the cows, say hello to the horses and most of all say hello to any other people you may pass (usually other cyclists or long distance runners in my case).
Unwind, relax and enjoy the ride.