Ah. I can relate to their problem, then. They can ask tour sites and places selling the book to put up warning signs, but a nice, tidy law would be so much simpler. Except it isn't, and usually effects all kinds of unanticipated things. Lawyers can panic over everything -- and in these litigious times, sometimes you can't blame them.

Trespassing sounds like bad advice at any time -- and aren't all the beaches in Hawaii free (IE no restrictions to passage?)