I have yet to talk with someone who made a plan, carried out the plan and everything went according to plan.
More often I have talked with people who have made a plan, carried out the plan, adjusted the plan as they went and ended up somewhere a little different than they had planned. And are quite thrilled with the results.
A plan is an excellent thing to deviate from. But if you try to deviate with no plan to start with, that is just wandering.