1BTC is a fairly large amount to gamble with. There are several fair gambling websites with a far large house edge. In he long run, you will submit your sum to them. Investing is a whole different game. Invest in a wrong person, a scam website or a ponzi scheme. Investing in a different crypto-currency is called trading. It is by far, the best method besides loaning.
If I have that amount it is better if you will allocate that with trading of alt coins or maybe half of it will be used for investing in bankroll casino's.
Or if you don't want to you can just simply hold that whole amount and wait for the price to increase but that needs a long time before securing your profit.
Whatever investment that will be fine but avoid those scams, you know all of them, ponzi's, hyip's, cloud mining.