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.
1 The sinoatrial (SA) node or sinus node is the heart's natural pacemaker. 2  It's a small mass of specialized cells in the top of the right atrium (upper chamber of the heart). 3  It produces the electrical impulses that cause your heart to beat.