Your tour of the volcanic formations at Santiago Island will last about 90 minutes. The difficultly of this excursion is rated as intermediate. The tricky part is watching where you step. Although this fascinating landscape is relatively flat, it is filled with uneven surfaces, crevices and the occasional crevasse. Your small group will be led by a certified guide. He or she will passionately explain every nuance of volcanoes and the geological idiosyncrasies of what you are admiring. By the end of the one mile circular hike, you might feel like a trained volcanologist.