IMO, and I could be wrong, but the drive from Minn/St Paul, other than the Mall of America in Minneapolis, has nothing of interest until you get to the Badlands, Custer STate Park, Crazy HOrse, Mt Rushmore area. Deadwood SD for a day and night, I found to be of interest.
Sinoatrial node is located at the junction of the superior vena cava with the right atrium.
Sinoatrial Node (SA) node. patch of modified cardiocytes in the right atrium, just under the epicardium near the super venae cava. this is the pacemaker that initiates each heartbeat and determines heart rate. signals from this node spread throughout the atria.