This is a great experience, and it only cost the price of admission to the park. I made the mistake of driving around the island and leaving only the second half of the day for the park. I recommend that you get there early and plan to make a day of it. Bring sandwiches and LOTS of water.

You can tour the caldera in your car, but just know that it is another 20-mile ride if you want to see where the lava reaches the ocean. When you park your car, if you are going to hike on the lava rocks to get a better look, take a backpack. Make sure that you have water for everyone, and I would even recommend snacks or sandwiches. This can be a tough trip, and remember, you are going to hike MILES over rough lava terrain. I didn't bring enough water and became dehydrated.

If you really want to enjoy it, go at night and see the lava in a spectacular state. Bring a jacket and a flashlight for everyone in your party. The lava rocks are jagged, so make sure you have comfortable shoes and the appropriate nighttime wear. This is a spectacular trip that is well worth the time and effort—truly one of natures wonders!