Excellent!
I'd get Stonehenge, Silbury and Avebury sorted ('cause that's where my main megalithic interests are). Then I'd make sure that every old folk, child and anyone else in this country had the basic requirements of food, warmth and medical attention. Then I'd initiate a first-class rail system; and if there was anything left over I'd go and buy myself a big tub of black raspberry Häagen-Dazs :-)