Kind of make it up as you go!
I second that. I've started my own RTW, after finishing my 'round USA. And I've done 5 legs so far, and made it south to Los Angeles in my Cessna Citation. As for the east coast of US, try some Washington DC, New York, all of florida, and the bahamas are always fun.
Anyhoo I don't have a set route, I sorta just land when I'm low on fuel, or getting bored.
-HF