Since all the four Shrines are located in environmentally vulnerable locations so it is advised to take care of the environment as well while being on the trip, so here are the thing you should not do while you are on this pilgrimage tour:
Do not throw your waste here and there.
Try not to carry any plastic bag but if you have so then dispose it in dustbins only.
Carry a refillable water bottle to save you money and the environment.
Do not set up your tent at any place there are several spots given for the tents only set up your tents at these places.
Do not disturb any kind of wildlife but click their pictures again and again.
Do not throw any kind of waste in water bodies.