Plus, there is another national park that doesn't allow RVs in certain areas -- South Carolina's Congaree National Park. Luckily, unlike Zion, Congaree National Park allows RVs on all of its roads.

When people are talking about their trips to Congaree National Park, the thing they want to discuss is the Mosquito Meter. Long near the bottom of most national park power rankings, the 42-square ...