Pictured: NOT the party!
I've been trying for years to set up a chase scene for a party of players. I want them to be chased by an opposing force, either a large creature or band of enemies. I've tried it several different ways: Once the party was in a wagon being chased by a larger force on horse back. Once it was a chase out of a bar and into the twisting streets of a port city. Once it was a dragon chasing them through a heavily forested area...etc etc etc. I always write a nice "script" with obstacles and split second decisions that they will need to make to continue their flight to freedom.