www.CostaRicaTicas.com

Does anybody know? As a U.S. passport holder can I stay there for 90 days, go away for three, and come back for 90 more?

This link outlines the requirements for U.S. citizens entering Nicaragua as tourists. Like Costa Rica I doubt that you will find any official publication dealing with the issue of "perpetual tourists". I think for that info you would have to contact some gringos living in Nicaragua.

http://www.enjoycentralamerica.com/nicaragua.htm

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Pura Vida
Only Irish coffee provides in a single glass all four
essential food groups:
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Alex Levine