Traveling events

Hey guys, could use some creative feedback. I would like help creating events or situations that would slow travel time down a bit. My location will mostly be in a swamp, but I'm curious how to stop PCs from going from town to the desired location in 5 minutes. I want to drag out travel time in and out of game. I'm game, I'd just give exhaustion, but what events or situations can I use that take up play time and extend the campaign? Anyone got a list? Or suggestions? I can post my atmosphere description and backstory if need be.