Managed to get in a strenuous hike on the lava flows before we left. There is a mile paved trail through the lava but you can hike anywhere. Saw a grassy area with a trail in the distance so we climbed our way to it.
You can see how happy Debbie and I looked after we got to the top. Of course, going back down was even more fun. The best part was watching Jim pick numerous cactus spines out of his leg.