1. Sudoku. Love this game. I have 2 puzzle books next to my bed as I write this.
2. Reading. Not just any reading...I like to mix it up with writers from many different genres. My favorite book at the moment is Stieg Larsson's Girl Who Kicked the Hornet's Nest. It's on my Kindle. Reading about Lisbeth got me very interested in math, and now I'm mulling on the possibilities.
3. Poetry. It can make little to no sense but I think sometimes it's just nice to try something out of your comfort zone in order to loosen up the brain muscles... here goes this morning's effort...
A cool breeze inward comes,
Fingers of Earth touching the soul.
A gift my muse has begotten for me;
A new morning to create from inspiration's pool.
Don't laugh...it's an early effort. :-)