Hiking would be a preferable way for people to enjoy the national parks. Biking is also allowed, but guides should accompany the visitors so they remain on trails and don't run over valuable plants, animals, etc. In addition, fires are extremely important to the ecosystem of all parks. If fires were never allowed to burn naturally, our parks would be so overgrown with weeds and the land would never be able to rejuvenate itself. The soil would eventually worsen and the future of entire parks would be in jeopardy.
Fires are necessary to keep the parks alive.
Despite complaints from residents near parks, the fires must be allowed to burn. Similarily, some areas of the parks should be off limits to visitors. The parks were established to be havens for plants and animals and to keep the environment as natural as possible. This philosophy keeps coming unglued and will continue to as long as we humans allow it to. As far as I'm concerned, the parks should not be owned by individuals, but cherished by people across the country.