G-n-G,
That moment that I am feeling the greatest, it hits me: I am surrounded by an infinite supply of beauty and wonderment, the sky, the foliage, even my breath flowing in and out of my lungs feels like an ocean of fresh water sometimes; it costs me nothing and I can't use it up, it's all free! I heard a saying that went something like, "The fish, though surrounded by water, is still thirsty, and it puzzles me."
Sometimes I get the best "rushes" as I reach the tops of tall hills!
I know what you mean about rain.