Your title started out nice enough. But "stop reading slashdot" is not what I would do, it is what I wouldn't do.
Assuming I were no longer constrained by money, the "suddenly wealthy" mentioned in the headline, bettering myself and others would probably be the next set of goals as I checked off items from my bucket list.
The daily money earned off $2.5 billion is going to be about $50K-$100K, which would be pretty fun. Every day you can spend what most american families earn as annual income. Personally I wouldn't be throwing out multi-million-dollar grants to organizations, but I would enjoy traveling while trying to spend $50K per day.
Spending the big money quickly on things would only be fun for a short term. Owning things would help a bit with the comforts of home, being suddenly wealthy means no longer being constrained by financial resources. There would be a few places I'd want to visit -- maybe tour castles and visit a bunch of countries -- but having virtually unlimited funds spread over time could be enjoyed with others who are less fortunate.
So I think if I was suddenly a multi-billionaire, of course an accountant would be one person I'd hire, and I'd put together a small account for daily spending, say $50K, added daily to an account for everyday spending. Then I would look to spend that much and no more, especially not dropping off millions for an endowment to some organization. At least until I reached old age and was ready to donate large bundles to other groups doing good in the world.
I would look to my own hobbies and activities that bring joy to myself and others. For me, that would mean turning my artistic hobbies of watercolor and photography into bigger parts of my life, not so much as moving on to my next career as it is developing my self. (Of course, I'd similarly pick up some of my wife's hobbies, but we share many of them.) We could enjoy life as a global tourist being generous with funds, buy new clothes and leave old ones to the local donation centers. I'd spend time doing other hobbies that are purely for fun, like kite flying, and with all that money that means visiting assorted beaches and kite festivals around the globe, enjoying the benefits of money while trying to appear as a normal but generous tourist. As I developed myself, I'd look to develop others as well. Why pay a professional to tutor just me when I can help develop the talents of others as well? Pay for classes in the subject and invite a few lucky winners with a similar skill level, and participate as just another person in the class. (I might make it known that I was the one paying for the class, depending on how much one-on-one time I wanted, or maybe just remain an anonymous member.)
Maybe go spend a few months on the endless beaches of Chile, along with my wife. Hire some people to help learn the language from our current skills into full fluency. Hire some art teachers to teach both myself and a lucky group of a dozen other similarly-skilled natives (where I pay their regular wages so they can attend the class) as we paint on site for a few days at each location, perhaps providing art supplies they could take home at the end of the week paid for by my accumulation fund. For my kite flying hobby, when I wasn't out practicing art, I'd probably have a bunch of various sport kites delivered to that week's hotel (which of course would be directly on the beach), and bring a crate each of solidly-built deltas, some thick-sparred revolutions that will survive the inevitable beginner crashes, and a some single-string kites for the unskilled. The lucky strangers who happened to be at the beach that day could pick one up, enjoy it for the day, and take it home. Maybe enjoy time doing whatever skill building my wife also enjoys, or maybe letting her enjoy her classes without me, both so we can enjoy our own individual interests and also so we have things to talk about. Then maybe move on to mountains and beaches of Peru and Colombia, again spending around $50K/day on groups of strangers to learn new talents along with us. Maybe distribute nice cameras to those hiking the mountain in my group. Along the way, if my daily allowance started to accumulate unspent funds, occasionally make a donation to whatever hospital or children's centers I happen to be near that day to zero out my accumulated values.