Could even be a deer stomping, which they often do if curious or alarmed.

Carnivores (like bear or cougar) walk very softly, so most likely it was a herbivore.

Strange noises in an unfamiliar place often sound much louder than they really are, at least to me!

I generally wake up for a lot of noises my first night out (actually, I often enjoy listening to them!) but I sleep through them after that.