OKay, I LEGALLY got married there and it was a piece of cake!
However, with that said, neither of us have ever been married before. I think that's where the big difference is.
For us, we simply brought our four witnesses, our travel cards (you get them at the airport), our passports, and then we had to give blood.
We gave blood right at the resort and it was easy peasy.
We actually did not translate or apostile anything. We simply took the Spanish wedding certificate to the Social Security office and DMV and switch our stuff over. That's it.