If we are to boil it down to it's essence, "sensing" is about bodily senses.
It's not so much about acting something out, as it is about taking something [e.g. an experience] in.
Se is drawn to the intensity of the experience. (low stacked Se - more easily overwhelmed - I believe)
Si on the other hand is more on the personal (or subjective) experience the object/experience creates.
On a different note, I love camping to. Even if it may be a bit more rugged, I sleep better in a tent.