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 master pacemaker is located in the atrium (upper chamber). It acts like a spark plug that fires in a regular, rhythmic pattern to regulate the heart's rhythm. This spark plug is called the sinoatrial (SA), or sinus node. It sends signals to the rest of the heart so the muscles will contract.