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. Located in the posterior wall of the right atrium, near the junction of the superior vena cava, the Sinoatrial (SA) node is the physiologic pacemaker of the heart, with an intrinsic firing rate of 60-100 impulses/min.