The one thing everyone wants and needs is a $25 million dollar house to live in.
Why someone with that much money and so little investment experience would worry about investing wisely is strange to me.
Buy a nice house in a gated and guarded community. Buy one to five really nice cars that fit in your one to five car garage. Give out one time cash awards to family/friends/people-who-helped-you-along-the-way. Give some money to a few worthwhile charities. Put the rest in an index money market. Live off the dividends.