If you're interested in traveling in the northwestern U.S., don't neglect Idaho. From interesting cities to the Sawtooth Mountains, the state has plenty to offer, as you'll discover when you take to the road in your Idaho car rental. If you want to focus on the great outdoors, Idaho is the state to do it in. Take a look at a few of the best routes through the state.
Drive your Idaho rental car to Shoshone and take Idaho Highway 75 north on the Sawtooth Scenic Byway - trust us, you'll find plenty to do. You can explore the underground ice cave at Shoshone, and see a lava field shaped by glaciers at Sculptured Canyon. If you have any literature buffs with you on your trip, you need to make a stop in Ketchum and see the Ernest Hemingway Memorial and the site of his grave - the author spent his last years here fishing and exploring, which you can still do here. Continue north to the Sawtooth National Recreation Area to camp out among the hundreds of lakes and hundreds of thousands of acres of federally protected wilderness. The surrounding area is also charming, including the Kirkham Hot Springs on Route 21 just past the Boise National Forest, where you're welcome to sit and soak after a day outdoors. There's plenty to explore, but if that didn't slake your thirst for the wild side of Idaho, try the next trip.
You don't have to leave the planet to get a glimpse of what lunar life looks like. Idaho's very first national monument, the Craters of the Moon National Monument and Preserve, you can look at lava fields complete with strange and otherworldly rock formations. According to the National Park Service, the area is just about due for another eruption of lava - so you should come and see it while it still retains its form. There's plenty to do around the Craters of the Moon National Monument and Preserve too, whether you're interested in looking for wildlife or seeking out a submarine in the middle of the desert (which you'll find conveniently located in Arco).