Jess I agree with Jessica, I think they were secretly hoping you would have your DW in Ireland. Also its possible that even though LA and Cabo are not far, they are not crazy about Mexico whereas they have been to LA and they like it. I know that probably makes no sense at all, but some people are weird about Mexico, they don't like it. Have they ever been to Mexico? Maybe you could address some of their concerns and show them that its a beautiful place that they will all enjoy. Just hang in there, they will come around.