Natural History. Birdwatching / Botany.
Get yourself a decent bird/plant/tree book and tell yourself you're going to learn a plant a week just from a walk. That plant you've walked past all your life but never bothered to find out what it was.
Once you've got your eye/ear tuned in you'll be amazed by the stuff you're now aware of and notice that you'd have otherwise breezed past.
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