You are unusually quick and adept at slipping through cluttered forests, even for your people. 

• Your base walking speed increases by 5 feet. 
• You ignore difficult terrain composed of roots, stumps, logs, and other hazards normally found in forests. 
• As a free action when you take the Dash action, you can increase your base walking speed by 10 feet until you use your action to do something other than Dash, Disengage, or try to escape a grapple.  Once you have used this ability, you cannot do so again until you finish a long rest. 
• If you can cast a spell that has a casting time of 1 action and increases your movement speed (such as longstrider or haste), you can cast it as a bonus action when you take the Dash action on your turn. 

Von Schwarzwald's note: Mostly, this set of abilities shows up in wood elves, but I've seen a human or two who I suspect might have trained to be able to do things like this.