Summary: those tree snakes = not much for humans to worry about, except that they have moved in and wrecked the indigenous wildlife. They're an ecological concern, not a human safety concern.
They are pretty harmless, but the Guam Power Authority would be lost without them, as they blame them for virtually every power outage on the island. They do get pretty big, like 7-8 feet.
__________________ "I drink a great deal. I sleep a little, and I smoke cigar after cigar. That is why I am in two-hundred-percent form." Winston Churchill