Maui Rob?
Don't be lured into the profession by all the movies, TV shows, and novels. They only show the glamour side.
The over-head is unbelieveable! And the turn-over in suppliers can just drive you nuts.
Then there's the paper-work maintenance: passport updates, credit cards in various names and various cities, P.O. box fees up-to-date, and try to get a decent set of random SS #s these days!!!
Then, with the forensic science (and NO, CSI is NOT real--Like most places have time for stuff like that) you need to attend to different shoe patterns, different personal grooming aids, even different snack foods.
Personal habits? Hell, you can't even spit anymore.
Note, the Feds have pretty much gone to paper-trail tracking.
Finally, you just get a nice, long-term relationship with a customer, and all of a sudden, HE retires, or gets promoted, or....whatever, and you either have to break in his replacement, or find a new customer to fill the niche. HOW? Advertising is pretty much out of the question, word of mouth is counter-productive, and you sure as hell can't hand out free samples.
Then there is income storage. Half the international banks are thieves and ALL of them charge ridiculous fees. If you use a safety deposit box, you are just throwing away all the possibilities of having your money work for you.
If you use a laundering service, the charges are ridiculous and those guys just get sloppy and can turn on you. Besides, no one has any pride in their profession any more...used to be, you could rely on folks, but that's gone away. We got cyber-space, and cyber professional pride...gone like a pixel.
Of course, real estate is one way, but, again, it is paper-work intensive. You buy one property and pay it off quickly, then use THAT to leverage your next purchases, filling in any REAL shortfalls with your "professional" income. The irony is you have to work like hell to make your income seem legal.
You can buy a property, hold it for a bit, sell it to yourself in a shell company for a major profit, then take your capital gains loss, and legitimize the money. But be very careful of the shell company's books.
Anyway...consider a nice job with the Park Service.
Be well and safe.