You've Got to Live a Little to be a Good Writer
In my blog post, Every Experience is Potential Fodder for a Future Novel, I talk about how bad experiences have the redeeming quality of being useful in writing fiction. Now I'm going to emphasis how important good experiences are for writing.
Sure it's hard to find time to run around and have fun if you're busy writing, but the inspiration and experiences you gain will actually make your writing easier, faster, and better.
Chances are, if you don't live it up, you'll face extra challenges in being a good writer. Sure, if you've never been to the ocean you can find a way to write a beach scene, but you won't be able to add the fine details that describes the feeling of being there in a unique way that sets your work apart.
So many writing classes seem to be about accessing ideas and bringing your creativity alive, but all you really need is to have an interesting life of your own. Then ideas will come at you so fast you'll just have to worry about learning to have fun with editing.
So go out and climb a mountain, or dance in a mud puddle, or take Vietnamese cooking lessons, or fall in love, or talk to strangers, or join a kayaking club. Then tell me how it went; I can't wait to read all about it.