I visited my son in the LA area a while back, went for a midnight fast food run. McDonalds, pretty imaginative, huh. Drive thru window, the car in front of me was a Rolls Royce.
THAT's what I'd do with a blank check, get a Rolls and just go places where it doesn't "fit." Or maybe go places where IT does fit but my boring ass doesn't, fanciest restaurant in my small city, or that part of town where all the bank headquarters and stock brokers are. Get out of the car in my beater, daisy dukes and chucks, maybe stroll into the biggest bank and ask to break a $20 bill. Give me a blank check I'm gonna fuck with people, and have a nice car my scruffyass mixed breed rescue dogs can go to the dog park in.