do  you  like to run in park or on a trademill  
Treadmills are an excellent exercise machine. They give more freedom and you get to other things like watch tv whilst getting exercise.
but  i prefer run in natural environment   
The trail at Raven Run Nature sanctuary has the most spectacular view.  The trail is about a 4 mile loop.
4 mile lap is huge  i think  
You beautiful though even if you have to walk some it is a superb trail
i will must  try this 4 mile lap next week  . 
Have you ever considered running in a marathon, they are hard work but it is an exciting experience.
no  but  it is a kind of very tough job  
yes they are hard. But with the right training and effort put into them they can be accomplished.