I love going hiking, which is what I prefer to call it.  Other countries have all sorts of terms for it like bushwalking, which is what Australians call it. 
Yes, I have heard that term.  I think that the British have some slang terms for it, too.  I like hiking, as well.
Yes, it's a popular activity no matter where you go in the world, not to mention all the health benefits of a good walk.
Definitely is good for the heart, soul, and body.  We hike up some small mountain trails in my local area.  It's a great family activity.
Well if you like a good trail, try out the Appalachian National Scenic Trail.  It's about 2,200 miles long give or take a few with changes over the years.
I have walked portions of the Appalachian Trail.  I haven't done the whole thing, because I don't have months to spend on it, lol.
Well you could also try the Florida National Scenic Trail, it runs through the Big Cypress National Preserve, great scenery.
I have never hiked any trails in Florida.  It sounds pretty, cypress trees are cool.  How long is it?
It's around 1,000 miles long with 1,300 miles planned currently if I'm not mistaken.
Wow, that would be quite the hike.