Substituting maple syrup for honey in bread
It's a good deal more simple than @canardgras makes it sound. I've had good success with the rule:


  To substitute maple syrup for honey in a recipe, use 3/4 cup of maple
  syrup and 1/2 cup sugar for every 1 cup of honey.


To get half a cup of honey (at a 3/4 ratio) you will want 1/3 of a cup + 1 tablespoon. (for most of us a 5/12 scoop isn't in the cupboard) 

Remember two important factors:
 1. This is for REAL Maple Syrup (Imitation Syrup will work, it just has a different ratio)
 2. Maple syrup has more moisture so baking time will vary (be extended).