Stretching for 82 miles through two of the most beautiful Cascade Mountain passes in Central Oregon, the McKenzie Pass-Santiam Pass Loop is one of the best road trips in the state. The loop begins and ends in Sisters, and it passes through some jaw-droppingly beautiful scenery, including lush river valleys, grasslands, and black lava fields dotted with snowy peaks. There are plenty of viewpoints, but if you have a bit of extra time, you can also take a short detour to Scott Lake, hike out to Proxy Falls, or spend some time marveling at the impossibly blue water of Tamolitch Pool.