Loot bag
general journal junk
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idealog
Create some treasure bags and leave them around for people to find.
Make little art supply packs, a journalling kit, some sticker packs, beads and string, small games to play, puzzles, random enjoyable things, whatever you like.
Maybe add some ideas/prompts too.
Don't forget to add a note so that the person who finds it knows it's a gift for them.