Unless they are going to Las Vegas, most people will skip Nevada all together and head right to the Grand Canyon in Arizona. But they will be wrong, especially if they are into biking, birdwatching, camping, climbing, fishing, hiking, backpacking, horseback riding and/or wildflower viewing. Explore the beautiful marble Lehman Cave and become a citizen scientist. Also, the Great Basin is where you’ll experience some of the darkest nights in the world.