I stand at the start of the trail, near the parking lot, with a couple of buddies, all dressed in full camo BDU's, and loudly talk about how many serial killers there are stalking this trail and how the police only manage to catch one every now and then when he gets too cocky and screws up. Usually whatever tourists are milling about their minivans/SUV's getting their gear in order leave after hearing that.
That or Barefoot Carl shows up and scares them all off. Barefoot Carl is a guy who wears the same brown jeans and faded Led Zepellin t-shirt every day, smells like he hasn't bathed in at least a week, has an unkempt ZZ Top beard and shoulder-length hair, wears a dead possum for a hat (he skinned it and left the head, paws, and tail attached; the googly eyes he glued on don't help), and never wears shoes. He always has massively dilated eyes from whatever drugs he's tripping out on this week (usually 'shrooms, but sometimes acid, always combined with weed), giving him that crazy stare, and likes walking up to random normies and starting a conversation about bigfoot/alien abductions/machine elves haunting the edges of reality/Lee Harvey Oswald/the Heaven's Gate cult... which he apparently only declined to join because they all wore matching shoes and he hates shoes because he 'feels more in tune with the earth when he can make direct contact with it'. Barefoot Carl can make even the regulars on the trails want to leave, but he's a pretty chill guy once you learn to tolerate his particular brand of crazy.