Originally Posted by polonius

The need to "get a good accountant" essentially makes income trebly-taxed for the American diaspora -- you pay to your home country, you pay to the USA, and then you pay again to some expensive accountant to guide you through the thicket of regulations and requirements.

In any case, back to the OP's question -- anyone visiting the USA is REQUIRED to answer the questions on the customs declaration and sign under penalty of perjury. No one is required to answer any additional questions. I cannot recall if there is a question about the "purpose" of travel on the form -- how about "because it's there"?