If you’re looking for extreme biking, you will find it at Death Valley National Park. It’s scorching hot in the summer, but freezing at night. Avid bikers love the park because it feels like they are in a 3.3-million-acre Wild West. As you can imagine, such a huge place has hundreds of dirt and paved roads for every kind of cyclist. Bicycle Adventures has a 4-day Inn Bike Tour and a 4-day Ranch Bike Tour, taking guests throughout 5,000 square miles of salt flats, sand dunes and abandoned mines in California.