I believe you are basically correct, although it's hard to define the word "spirit" because you might equate it with God, an angel or something like that and I might define the "Spirit" as being the energy of the Universe.
Think of your body and your "spirit" as being two seperate things... the body being the physical part and the "spirit" being the energy that runs the body. I know believing they are seperate is anti-JW, but if the body dies, and the "spirit" lives on... then it's sort of the energy that does. (I am bad at explanations)
I believe that God is less human that people try to make "Him" be, they always equate God on human terms... but if we thought of God as being the Spirit or ENERGY of the Universe, it makes more sense to think that whie in nature you are having a SPIRITual experience... because nature is fed by the power of the sun, which in turn might be fed by the energy of the Universe, or what I believe might be God or the BIG SPIRIT in the sky.
Or did i just confuse myself ?