My husband and I (early-mid 30's) decided (since we both hate flying) to try out the train going from RI to Orlando this past May. I can say that we absolutely loved it going down - as had a blast looking out the windows at the scenery (hint: sometimes the scenery is frightening but other times it was beautiful). We ate in the dinner car and sat across from an eldery (worldly) gentleman who had been using the train as his only form of major transportation for years - it was very interesting to chat with him. I, for one, get motion sickness very easily and I thought when we were seated while riding backwards in the dining car, I thought I would get sick. Not the case at all - I had a nice glass of wine with my meal and thoroughly enjoyed every minute of it. The tables all had white linens and candles going and it was actually very romantic. Please keep in mind - although we had seen pictures on the amtrak website of the viewliner standard rooms, we were not at all prepared for what we saw when we arrived - the rooms are even smaller than you think. I thought we would feel cluttered and cramped but we actually did ok - even a small tv screen that plays first rate movies all day/night. We slept just fine through the night - waited to take a shower in our hotel room b/c I am not one to share shower accomodations with a bunch of people (call me a prude).
The ride back was not as much fun and I can only assume it was because we were coming back from vacation - the thrill was gone. But we thought the ride was much more bumpy and we had a tough time sleeping. All in all, we thoroughly enjoyed the experience and are going from RI to Orlando again this March. Here's another hint - if you can splurge a few extra dollars get the business class seats from Boston to NY or DC both ways - you will be very glad you did. We used business on the way down (lots of room, quiet, free soda, newspapers) and loved it - on the way back, it was mayhem. B/c there was no more room in overhead compartments, we were forced to sit in small cramped spaces with our luggage under our feet which didn't leave us much room. Also, as TandyR said, you should book as soon as you can because they jump their prices quickly from day to day; we were lucky when we made our reservations last March for the May trip - they had a buy one, get one free deal - keep your fingers crossed for that one again! I hope this info helps and let me know if you have any other questions and I will do my best to answer them.