Here’s a hot topic:   

Volcanic activity from 5 to 9 million years ago has left
lava about 2 km under the sand at Hot Water Beach, about an hour from where we are staying. So 2 hours on either side of low tide, you can dig a hole in the sand and hop in
for a natural hot tub. It’s beautiful and it’s Kasey’s favorite beach so far. She has some photos we’ll post later. But I wanted to share these in the meantime: