Have you heard of Dabble? It's a website where you can find all sorts of fun classes/workshops to take in the city. As a teacher, I love this sort of thing. Learning new things has always been my favorite part of teaching. The range of classes that are offered is huge- all types of visual art, cooking, music, writing, tech stuff, public speaking, design, dance, etc. You can also propose ideas for classes you want to take or propose to teach a class.
I'm looking forward to having free time to take advantage of this sort of thing!