Wear compression (don't worry - everyone does it, you will fit in just fine), don't be rushed with travel, feel comfortable in your housing arrangements, rest/sleep when you can (or shut your eyes for a power nap) and focus on yourself. Consider any time spent in lines, traveling or waiting for somehing - as something that may stress you out.
Review course maps, race day itinerary/schedule, packet pick-up, transition area, read forums to better understand logistics/timing of race week to-do's, parking, things for your family to do on race day or where they can see you. Consider travels on race day morning (from your hotel) as well as leaving the race.
Review all travel arrangements in the months and weeks leading up the race, review race website, review forums related to the race, pack early and always have a second option.