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.
The sinoatrial node (SA node): is a small strip of tissue that contains specialized cells. The SA node lies in the wall of the right atria close to the opening of the superior vena cava. Cells of the SA node set the pace of the heartbeat under normal conditions.