Reach intermediate level on powerlifting lifts listed at https://exrx.net/Testing/WeightLifting/StrengthStandards at 165-190 lbs. bodyweight.
Make a documentary.
Create an album of music.
Publish a paper in a peer-reviewed mathematics journal.
Publish a paper in a peer-reviewed natural history journal.
[secret] x 3*
Write a book on proofs with Coq†.
Learn, to an intermediate level:
Get out of debt.
Publish a book of creative work (essays, stories, poems, or a novel).
Learn to paint.
Ride a fast motorcycle on a coastal highway.
Hike the Annapurna circuit.
Drive from Alaska to Argentine and write a book about it.‡
[secret] x 3
Tour Japanese temples and shrines to see sangaku (算額).
* Some things are better left unwritten.
† Or Agda.
‡ The safety and traversability of the Darién Gap is questionable, as is the safety of most of Central America. I'm considering sailing a similar route, but it would be a very different journey and presents many dangers of its own.