There is an amazing amount of stuff you just can't show with pics. There are exhibits all through the ship about other ships, or events. My wife and I spent 5 hours on aboard, and we were not taking our time. We will go back with our kids, hopefully soon.
I highly recommend it. If you like to fish, it's only $16 for a day permit, so don't do what I did and leave all your gear at home. There are some really cool shops, and tons of other thing to do. Sit on a dock and watch tankers go by, some really cool bird watching stuff as well. We stayed in Aransas pass, and crossed the ferry to Port Aransas every day. If you come here, I will tell you an awesome restaurant to try.