I'd open a couple of big Machine Shops which would service larger oil and gas companies. One would be a manufacturing shop manufacture smaller parts and one would have capacity exclusively for larger parts and other machining services. both shops would need a ton of square footage for all of the machinery I'd want in them. The goal would be to crush all of the other area shops quality and delivery times in order to secure a lot of business and lock down the region at least so to do so I would need to hire the most skilled workers I can find along with the best machinery and have the ability to run my shops a couple of shifts atleast Mon-Fri. I work as a buyer/planner for a large oil company so I already have some contacts to get the idea off the ground I just need to get that bread up first.
I'd also try to buy into a sports team
I'd also put money away for my childrens educations and I'd set up bank accts for each of them with 30 mil each for when they graduated college.
The rest I'd put my close family on, put some money in high interst bank accts, buy a crib in Houston, get a fly condo in NYC, and a beach front property in the carribean.
I cant front, I'd also donate money to different charities as well.