Learn to juggle. Don't know why this has cropped up in my head - I'm definitely no performer. I just like the idea of keeping more objects in the air than I have hands for. And it allows me to make interminable jokes about dropped balls.
Find some volunteer work to engage with. Probably in the environmental/conservation line. Not sure what's available for someone living in the middle of a huge city but I'm sure there's something.
Learn a language. Ok, it's more of a long term thing - and I should learn French so I can converse with my nieces. Or at least know what they're scheming when I babysit.
Join Toastmasters or do some sort of public speaking training. I can jump out of planes or swim with sharks with no problem but the thought of talking in front of a crowd makes my sphincter clench.
Get a tattoo. At least one. I've got a deadline on this - need to have a design chosen as I have an appointment with a needle in a couple of weeks.
Send letters. Randomly.There will be more as they take shape in my mind.