The Sunbelt Conference 2013 will be held in the main building of the University of Hamburg. The best way to reach it is via rapid-transit lines (S-Bahn) S21 S31 S11 station Dammtor or the subway (U-Bahn) U1 Station Stephansplatz. You find further information, like timetable, network plans, and pricing for the local transport on the official website of the HVV.
If you get here by train you will reach central station where you can get all connections with U-Bahn, S-Bahn and even buses. Most mainline trains even proceed to Dammtor but you might want to check in to your hotel first.
If you get here by airplane you can get on the S1 which will bring you from the airport to central station, where you can get all connections.
If you get here by car you can calculate your own route using this google-placemarks.

The most convenient way to get arround in Hamburg is the public transport which is very reliable and buses trains and subway-trains pass on a high frequency. To find the ticket that best serves your needs and for information on the itinerary, network plan, and pricing please visit the official website of the HVV.