I think the train is a great way to go if you have time. Great way to see the country. If you are planning to take the train to go to LAX you might want to give yourself a day in LA then take the flight the next day. I don't know where the train station is in relation to the airport. You would also want to check the airfare roundtrip San Antonio to Honolulu and back rather than LAX to Honolulu and then back to San Antonio. It might be better to do the roundtrip than the open jaw. Yes, I do work for an airline. As a matter of fact, you might want to call American and see about the air and hotel package.
What we do very well is, we don't mess it up except in even numbered years.