Answer:
Oklahoma (used a gas station bathroom but didn't by gas)
Explanation:
A free rider is someone that benefits from using a service or a product but that doesn't pay for it. E.g. a person that lives in city A and travels to city B and uses public parks. The parks are financed through taxes paid by residents of city B, since you pay your taxes in city A, you are a free rider in city B.
Her trip to Colorado wouldn't be considered a free ride since the bighorn sheep and the river are things that occur naturally and no one paid to make them.