We decided to do a symbolic ceremony. We are getting legally married the day before we leave for Mexico (it happens to be April Fools Day - how fitting). We did this for a few reasons - it was more cost effective, we didn't have to get documents translated first from English to Spanish, and then Spanish back to English (marriage license). I have heard some resorts/states can take a very long time to give this to you, which means it can take a long time to get the marriage registered back at home.