If you are concerned about working (or wearing yourself out) on a Sunday, don't worry about it. Remember to enjoy yourself on the hike and it won't be a chore or work if it concerns you. Think about this though... If a Priest was out for a stroll on a Sunday and came across a house on fire, do you think he would stop and help to put out the fire? I would think yes, even if this was hard work. The mention of sins are supposed to prevent people from doing things which prevent true happiness and fulfillment in life. Worry more about finding peace and fulfillment in your life and being a good person. It is all anyone can ask.
