A lot of things make me feel intune with nature.
One of my favorites: By yourself, one a nice day, walk deep into the woods, away from the path, find a nice spot to relax, and just... Be. Make no noise, movement. After about an hour, nature will have slowly eased back into it's regular order, and you can observe it.
Or another: Get stoned, and go somewhere outside that you like. Somewhere not changed by man so much. And then.... Hug the Earth. You can't wrap your arms around it, but you can certainly express gratitude.
Get stoned, and spend the night just staring at the sky. Feel the earth beneath you, nurturing you, protecting you, hugging you back.
Feel connected in a primal and sophisticated sense, to everything life entails. Feel nature coursing through your own veins.
Breathe Nature.. BE Nature.