if you want to safe to double in a year. buy and hold bitcoin is the best choice and $100,000 is a decent amount sufficient to holding
I wonder where you can buy ~222.222 BTC in one transaction. Maybe do small chunks of transactions and place it on different wallets at different websites so even if your account gets hacked, you will not lose all your money. Just a warning though, people will always target your account once they found out that it holds this much money.
of course you do not have to buy that much in one transaction, and very much to buy bitcoin with big amount but very safe. LocalBitcoins it seems very safe.