If you want to avoid spending too much money on bad food in Cuba, consider eating at a paladar or two during your trip.
I posted a blog on paladares at http://www.travelblog.org/Central-America-Caribbean/Cuba/Oeste/La-Habana/blog-224659.html . I've been here in Havana for three months researching these private restaurants. I've written a short but concise paladar user guide; you should check it out and/or message/comment me for more information or further recommendations.
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