[sw104]

Don't know why you're being downvoted. Walkin' isn't really slang but most people use walking/hiking interchangeably.

Hiking is just more official/more serious, like 'running' as opposed to 'jogging'.

[NikkiA]

And ramblin, don't forget ramblin.

eg: https://en.wikipedia.org/wiki/The_Ramblers

[RamblingCTO]

Love it! I'm also an avid long distance hiker haha

[RamblingCTO]

Okay got it, so it's not like hiking is more in a hilly area (but I would guess more probably because it's more serious) or something. I also wondered if when you use walking you wouldn't use hiking. Thanks!

[qingcharles]

As a Britisher I generally using hiking more when it is a slog; that is to say, when there are more hills or countryside involved.