Gamboa Trail has only one trailhead, so you'll be trekking it in and back out. The total elevation difference for Gamboa Trail is 1,759 feet which is about average. Sometimes this hiking trail gets really dry, so make sure you check current conditions and fire restrictions with local forest authorities before you head out. Different parts of Gamboa Trail are at very different elevations which of course means you need to be prepared for different conditions on different parts of the backcountry hiking trail. With its 6.6 miles of walking distance it's a mid length trek. You should count on this backcountry walk taking about 6 hours, but you never know stuff could go wrong and you could get stuck so be prepared for that. Keep in mind that this is a long hiking trail, so do pack enough food to last the whole trip.