That is quite fun. I'd gladly sit and stare at grass growing, just to cath it moving. I do that with clocks sometimes.
When I can, I'll play Football. I've recently found that I'm amazingly OK at jumping in front of balls being kicked at horrific speeds towards the goals.
And playing instruments is amazing! Get a nice echoey chamber, or a place with amazing acoustics (like an old school hall), and let rip with your Trumpet! The reverb is amazing. Just standing there playing, letting the music wash over you. Get 4 Trumpeters at each corner and stand in the middle...you could melt with delight!
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