Spend your day on a dormant volcano deep into the lava beds and hike through some caves too! This is a great place to spend the day and learn to appreciate the power of nature. As you visit, stop in ARCO to see the naval submarine exhibit. Its a small park with the sail of the USS Hawkbill. Hopefully you'll get a chance to meet Dick, the WWII veteran and park curator. He will give you a great lesson on nuclear submarines and show off his museum of naval artifacts. A fascinating adventure.
We stayed at the KOA-Craters of the Moon in Arco and had a great time.