Make sure you're adequately insured (life, health, disability, auto, home, umbrella, etc.)
Make sure you're diversified. My personal rule is no more than 3% in any one stock.
Pay off all high-interest rate debt. You've probably already done this.
Save for your kids' college if you have any and think that's appropriate.
Then yeah, VTSMX in a taxable is what I'd do.