This was very fun! Google "lava river cave flagstaff directions" for spot on directions.
Plan 90 minutes from the time you leave your car until you get back, wear something other than flip flops, bring a light jacket, find a bathroom before you leave town, bring a better light source than your iPhone, and don't take poor fido if you care about the condition of his feet.
You'll find a headlamp to be a big bonus and will make you the envy of the other cave explorers. Jeans are handy in case you stumble and meet with the sharp embers.
This is an easy cave to get through, after you scramble a little to get in, it becomes more level with a (sharp) lava ember floor. There are some slick spots, so be careful of wet rocks.
When you have the choice of going right or left on your trip toward the back of the cave, know that if you go right the ceiling height is about 40" in places with an uneven floor. Going left has a nice tall ceiling. You'll encounter other low ceilings along the way, but that's the lowest.
The fire roads to get to the cave are a bit narrow for two cars in places and probably get yucky when it rains. Your car will be in need of a wash from all the dust.
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