fees/permits
Park entrance fees are $8 for private vehicles and $4 for individuals on foot, bike and motorcycle. Individuals 15 and under may enter the park for free. All entrance fees are valid for seven days. Alternatively, the America the Beautiful pass can be purchased for $80, allowing free entry to all national park and national forest areas for one year.
cave exploration
The lava tube caves of the Monument are fascinating places to explore but can be dangerous. Take the following precautions when exploring the caves.
Carry at least three light sources per person. There is no natural light in these caves and you do not want to have to feel your way out in the dark because your batteries went dead or your bulb broke.
Wear sturdy shoes with thick soles. Lava does not always form a smooth surface and thin soled shoes can be punctured.
Wear a hard helmet. As with the floor, the roof may contain sharp and rough surfaces. Protect your head.
Let someone know what cave you will be exploring and when you plan to be back. If you don't show, the rescue personnel will know where to start looking for you.
hydration
The park's black volcanic cinders and rock heat up quickly on sunny days, leading to ground temperatures over 100 degrees. Bring lots of water, and drink it regularly; potable water is not available away from the visitor center and campground.