Walk quietly along the river
When you get down to the river from the parking lot, you often have to walk a little along the banks before you reach the starting point for fishing.
Walk quietly along the river and preferably a bit away from the river bank, which in many places can easily be done.
The fish in the stream are large and shy, so they are easily spooked.
Walking quietly along the river also applies when you have finished fishing yourself, so that you do not affect the fishing negatively for others om Your way back to Your car.