Cook the popcorn according to manufacturer’s directions, pour into a very large bowl, and set aside. Melt butter in a saucepan over medium heat. Stir in the brown sugar, salt, and corn syrup. Bring mixture to a boil, then reduce heat and simmer for 5 minutes, stirring constantly. Take the saucepan off of the heat, and carefully stir in the vanilla extract and baking soda.
Pour the caramel over the popcorn and stir well. Add the chocolate chips and almonds, then stir until thoroughly mixed. Pour this mixture into two large, deep baking pans and sprinkle with the shredded coconut.
Bake in preheated oven for 1 hour, stirring every 15 minutes.