Write what you know. Yeah yeah. Ernest Hemingway said it. Mark Twain said it. But then, they didn't spend most of their lives in a suburban enclave leading a pedestrian life... not even close!
Twain, or rather, Samuel L. Clemens, was a riverboat pilot, journalist, lecturer, entrepreneur, and inventor. Hemingway served in World War I and worked in journalism, living in/traveling to Paris, Spain, Africa, Cuba ...
I mean, really now.
Sam, Ernie: Don't you even try to tell me what to do.
Furthermore, I like to learn new things, things I don't know. For me, that's a great impetus to write. It's true in my work-life (where I get to learn about stuff like unums, axions, exascale computing, aerogels, and what-all) and in my fiction-life. If I'm not learning something new, then why bother? I guess that's why I like doing research! (And yes, it's sometimes hard to stop peering into Google books from the 1800s and arcane websites and Pinterest boards.)
In fiction lately (checking my browser bookmarks for Book #5), I've been happily delving into the world of 19th century "newsies," voodoo, and graham gems, and more.
Now THAT is FUN!
I dunno, maybe Hemingway/Twaine's dictum works if you're ex-CIA, or a war news correspondent, or a on-the-run jewel thief, or a Navy SEAL, or worked at Los Alamos with Oppenheimer.
But as for me?
I'm heading straight for the wide unknown open spaces. That's the (writing) life for me!