Big, think this through IN EVERY respect. You open your car-wash business. You're going to need to get (depending on the state) insurance. In some states you only need this if you have 1 employee (other than yourself) others it is manditory. Get a degree or licence. Whats better than taking out student loans when you know you have the money already to pay them back. This is a long term option and not for everyone. I say licence because if you had (enough money) to start up a little car lot and got your licence to sell cars, thats a commodity with fluctuating stock/prices. Nothing big, you could open up the seedy little business on the corner in the industrial area that sells $500-$10,000 cars. Nothing big and remember "Wu-Tang financial"? You have got to DIVERSIFY. Another option (though riskier on airplanes) is "smuggling" money out of the country. I dont know if you have a wife (or brother, sister, mother, uncle) that you trust with your life or not, but walk/drive/fly it across the boarder. DO NOT DO IT IN THE CAYMAN ISLANDS! These are notorious for smugglers and it is really suspicious when transfers go back and forth. Set limits. How much you want to earn, spend. Make goals vacations, trips, houses, and even retirement. REMEMBER you dont want to live "the life" you cant with illegal money, its fucking stupid. Whats the good in spending 3 years making a million if you go to jail for 10 and have it confiscated. AVOID Insurance: They have their own laws, system, AND investigators. Police/Feds: Obviously. Investments: The IRS is not stupid, SLOW, but not stupid. Lines of Credit: BUILD THESE LEGIT!!!, theres no reason not to except impatience and greed! DO Rent to Own: It NEVER hurts to ask. Ask the owner if he minds small payments over a couple years to buy a house. DEGREE/LICENCE If you had a contractors licence you could buy houses, fix them up, flip them. Add 5k to the price when you put it in the bank. Depositing 150k legit with 5k illegal is almost unnoticible.
What ever you do bro you know the only one who will be in that jail cell feeling bad for you when you get caught is........yourself.
EDIT* Customs does have dogs trained to detect money.