Of all the routes, Machame is by far the most scenic albeit steeper route up the mountain. The Rongai is the easiest camping route and the Marangu is also easy, but accommodation is in huts. As a result, this route tends to be very busy and ascent and descent routes are the same. Although the Rongai route is a flatter walk it offers less opportunities for acclimatisation. The Machame and Lemosho routes both allow better opportunities to "walk high and sleep low" which is critical to avoiding altitude sickness.
The fourth day of trekking starts with the ascent of the Barranco Wall, which is considered a scramble in climbing terms. The top of the Wall has attractive vistas of Kibo and the surrounding landscape. The trail continues with many up and down sections across small streams and rivulets, and finally crosses the Karanga River to the Karanga campsite.