1 Easy, mostly by car, minor walking along roads.
2 Fairly limited walking, some slopes involved.
3 Moderate, 3-4 miles walking with some slopes.
4 Difficult, hiking required off road, may have short steep sections, total of 4 miles or so. For experienced hikers.
5 Strenuous, extended hiking on trails with steep terrain, 4-8 miles. For experienced hikers.