Ask HN: What would you do with $200K

Just finished a contract that left me with a little over $200K cash in the bank after taxes. Trying to be smart about what to do with it. Leaving it in the bank is not a good idea.

Ideas so far:

    - Buy real estate, maybe rental, maybe commercial
    - Dump it into an index fund and hope to get 7% + per annum
    - Launch a startup I've had my mind on (only need $10K to $20K)
    - Invest in other startups
    - Buy bonds of some sort
    - Day-trade individual stocks (I day traded successfully ten years ago)
    - Buy individual stocks as long-term investments

I'm sure there are other ideas out there or brilliant combinations of the above.

Any thoughts you'd care to share?

Thanks.