Just "discovered" your YouTube channel. Awesome footage. Are you taking the Northern Cross-Island Hwy a lot?
We hike almost every weekend, but don't encounter snakes very often. Maybe I am not looking closely, or snakes are just not active during the time we are hiking, or they disappear too quickly. Once I saw a very long rat snake (I believe it was one) in a creek in the Pingxi area. I was surprised to see it "standing up" in the water, about 30 centimeters or so. Was it looking for fish, I wonder?