Hmmmm.....Snakes. When we lived at the Jersey Shore (Ocean City), we weren't too far from the Pine Barrens. There are a LOT of very large snakes in the Jersey Pine Barrens. We belonged to a radio control airplane club, and it was surrounded by woods. Newcomers to the hobby always want to fly as far and as long as possible. That meant they often had planes landing in the woods/brush, and it took a small search party to find one (they aren't cheap). I always ran into a snake on these excursions, and hated it. They never seemed to bother anyone, and if they moved, it was to slither away. I saw some REALLY big snakes out there.
We never ran into snakes until fishing the Neshaminy Creek (and a few in the Delaware River). I fished the Neshaminy when I was younger, and told my wife to simply stand still if a snake swam nearby. It wasn't too long before a two foot snake of some sort swam past me (about 15 feet away), and was moving downstream toward my wife. I know my wife, and considered keeping my mouth shut.
When I told her not to freak out when she saw the snake, she freaked out! She began running toward the center of the stream, and the snake did its best to move toward the opposite bank. I kept yelling for her to freeze, but that only made her move more quickly toward the snake. She had nearly reached the opposite bank, and the snake tacked over to the bank she had been standing near originally. Anyone watching this might have thought my wife was trying to catch the snake!
I've run into snakes holding underwater while crossing shallow riffles. I'm not a snake expert, and don't know why they do that. One large snake was very close to my leg, but I moved slowly away, and it simply kept an eye on me. The Delaware River has some REALLY REALLY large snakes that move through the water, but they also change course to avoid humans. My cousin from Long Island visited us when I was around 18, and we had a little 10 foot jon boat in the Delaware. We had to drag the boat past some rocks, and a HUGE snake swam past my cousin. He jumped out of the water like a missile, and landed in the boat. I never saw someone so terrified, and had to laugh. I've never seen a snake swim toward a human, nor move on land toward a human.
When stepping over logs and fallen trees, we toss some pebbles first. Even then, we take a look before leaping. Most snakes we see on land are sunning on a rock, or in a patch of short grass, however. In that case, just walk around. I've only seen one person bite by a snake, and it was a kid that reached into the Neshaminy Creek to grab a large water moccasin. The snake bit the kid's hand between the thumb and index finger, and a camp counselor had to use pliers to pry the snake's mouth off the hand! It was given a new home in the camp's nature center.