Rimfold turns a few trip details into a day-by-day national park plan, a cost range, and a poster-style map you can save or print. Most park trips start as 40 tabs of blogs. Pick a home city, a park, and how many days. You get overnight towns, a sane daily pace, drive times, and ballpark costs from curated park loops — not a chatbot. Stay with one park, or add a nearby park only when the drive is real. 28 parks, plus classic 7-day loops: Grand Canyon, Zion, Yellowstone, Yosemite, Smokies.