A mining farm really require a lot of patience and work , I wouldn't suggest it unless you are passionate about mining and you are not seeking for profit only. With such a large amount , I would do some trading or simply buy and hodl bitcoin for long term. You can also invest in some ICO to x2/x3 your bitcoins but make sure you do your homework before that.
If you are still young and you did not depend on that money for a living, you can invest your money like buying bitcoins and holding them. You need time to wait until its value increases and sell. If you wanted to double or triple your money you really need patience.
well, investment is everyone's choice. investing wherever you like, will be the risk you are preparing. Well, if I were you, I would probably invest in altcoin, as well as land. it will be the best investment in the long term.