This topic has recently come up a few times lately. I'm getting married at the Iberostar Tucan on October 18th and when i heard of this i e-mailed the resort and the wedding coordinator and she and they all said that "the documents do not need to be translated" they said the resort will take care of it. But, if you do, here is a web site that would be able to help you do the translation.
http://babelfish.altavista.com/tr just get the english to spanish translate.