About 3 miles from the Ira Spring Mason Lake Trail #1038 trailhead, you come to a fork in the trail that is very well marked. Follow the Bandera Mountain Trail to the right to head up Bandera Mountain. The trail starts to get pretty rough since you have to climb through a boulder field and it even disappears a few times. The trail is safe and, as long as you're being careful, it shouldn't be a problem. The views more than make up for the lack of a good trail!