Something I've picked up as of late, a hobby to enjoy in a more physical, hold-it-in-your-hands way. :)
Postcrossing is an activity/website, in which you participate by requesting people to send postcards to – and you, in turn, being assigned to others to the same end. It's about exchanging postcards, about learning about the recipient and putting together an original message, about sprucing cards up with postal stamps or whatever stationary-friendly stuff you have lying around, if you're inclined to either.
My current "routine" consists of:
-buying a variety of postcards when I get the chance, usually from stationery stores, tourist-y destinations and maybe merch stores :)
-if buying from a place that has rubber tourist stamps, stamping each with one (as a special Czech Republic bonus ;))
-requesting an adress when the writing day comes, learning about the recipient, picking a fitting card from the collection, writing a personal message...
-...and, as along with (key)charms I also have a thing for stickers, and sometimes get them as or alongside merch, from con artist alleys and similar, possibly spending one or two to decorate :)... along with doodles, or whatever stationery I can trade off my resident expert.
-sending! And occasionally checking the post office for incoming cards, since I collect them poste restante.