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 heart actually has two natural pacemakers. The sinoatrial node (SA node) is the primary pacemaker and the atrioventricular node (AV node) is the secondary. The AV node is in a bundle of tissues on the border that separates the right atrium and the right ventricle. When the SA node sends out an electrical impulse, it goes straight to the AV node.