My husband loves riding the train (the kids and I do, too). It reminds him of his GrandDad. For Mother's Day (you can do it for Father's Day) he drove me and the kids down to Corpus Christi on a last minute weekend trip. It was GREAT! We got a hotel room, spent the next day at the Mustang Island State Park beach and ate in restaurants *only* :)In return, I'm planning a train trip to Dallas. We'll visit Six Flags, spend the night in Dallas and find somewhere interesting to eat (we like "unusual" foods, not burgers every night).
Train travel is great because the kids don't have to stay seated every minute, there is an Observation Car with huge windows, a dining car, a snack lounge, the kids don't have to whisper and the seats are roomy and comfortable enough to nap in when the kids to get tired. It's also less expensive than air travel. It's great!
Good Luck with your planning!