The total elevation difference for Mhihi Waialae Trail is 1,885 feet which is about average. Mhihi Waialae Trail is quite long, so make sure you bring plenty of supplies. Mhihi Waialae Trail is a one trailhead hiking and backpacking trail, so you'll be trekking it in and back out. Being 27 miles long; it's longer than many backcountry trails. Some parts of this backcountry trail are much higher up than other parts of the backcountry trail, and that means that some parts of the backcountry trail could be very different from other parts of it. At parts of the year this vicinity sees very little rain, so do check for current fire restrictions before you go if you plan to bring a stove or make a camp fire. This backcountry walk should take you about 4 days, so better have big a backpack to fit all the stuff you need.