Memory/Mind Palace or Methods of Loci has always been fascinating to me. I read the book Moonwalking with Einstein by Joshua Foer several years ago, and I tried to use some of the tips to improve my memory. I just think it’d be cool to be able to recite poems and quotes off the top of my head.
I would also like to master writing and reading non-Roman scripts. I can read/write Korean hanja, Japanese kanji and hiragana/katakana, and some Chinese. I would love to add Sundanese script and perhaps Farsi or Cyrillic to my repertoire.