For me I've leant there's little worse than rushing to get to a punt on time - risk of ruining the punt. My personal routine, whenever possible, is to travel somewhere nearby an hour or more before, and chill out over a coffee (nowadays I save the beer for a post punt pint), tuning out the world and relaxing. I then complete the last leg of the journey, arriving outside the punt location 15 minutes or so before the appointed time.