Lava tubes are part of Central Oregon's unique landscape, formed by flowing lava underneath the hardened surface of a lava flow hundreds of thousands of years ago. Pronghorn Resort has a lava tube on its property, so they're offering a unique bike and brunch experience to explore the mouth of the cave. The adventure starts by choosing your bike rental and grabbing a boxed brunch from Cascada at Pronghorn. When you arrive at the cave you're greeted with a coffee station and time to explore and eat. Included in the boxed brunch is a breakfast burrito with house-made Italian fennel pork sausage, cheddar cheese, scrambled eggs and pico de gallo with a side of fruit.