This year, the National Park Service (NPS) is celebrating a century of protecting America’s on-land treasures—from historic properties and landmarks to, of course, the parks scattered throughout the country. Many national parks that call the western U.S. home (the Grand Canyon, Yellowstone, and Yosemite—to name a few) are known to attract park-goers, and since entry to all parks is free from April 16 to 24, what better time to take advantage?

The only thing standing between you and nature is deciding the best way to explore the western part of the country, and we have your answer: by bike.

On behalf of the NPS anniversary, a Seattle-based company by the name of Bicycle Adventures is treating riders to an exploration of the world’s outdoor sites on two wheels. Twenty custom-made itineraries allow in-depth looks at national parks across seven U.S. states—from Montana all the way down Southern California—working to connect riders with the destinations at a relaxed pace.

Take a seven-day bike tour of Hawaii to visit both the Puʻuhonua o Hōnaunau National Historical Park and Hawaii Volcanoes National Park. Or embrace a totally different setting on the weeklong Mickelson Trail adventure in South Dakota, biking through Badlands National Park, Mount Rushmore National Memorial, and making several other monumental stops along the way.

Have no fear; two expert bike guides will accompany you on your journey, sharing knowledge of each destination while making sure you stay on-course. Plus, accommodations and most meals are included along the way, with your luggage transported via van for maximum convenience.

>>Next: AFAR Staffers' Favorite National Parks