No bikes, no dogs, no guns
The National Park Service is considering a plan to relax their regulations that govern bicycles on trails - a change potentially made without public notice, review or comment which would allow Park Superintendents to designate trails and trail use. That means that you could be meeting a cyclist coming down the hill on the Alum Cave Trail in the Smokies as you huff and puff up.
That scenario in the Great Smoky Mountains National Park is admittedly far fetched. But there are good reasons why bikes, dogs and guns (did I leave anything out?) are not allowed on the trails. The National Parks are meant to preserve the environment and leave it unimpaired for future generations. You want to bike with your dog and gun, go to the National Forest where hiking is just one of many uses.
I have nothing against cyclists, hunters or dog owners - well maybe dog owners if they can't control their dogs. Just not in the National Park.
You may want to look at this article and write to Dirk Kempthorne, Secretary of the Interior at
1849 C Street, N.W. Washington, DC 20240