Well, Hollywood and Vine is our favorite buffet at WDW. We have six very different tastes so we love the variety, but you hear good and not-so-good comments about it all the time. My kids have always loved Fantasmic, even when they were toddlers they were never scared. It is our favorite night time show at WDW. It really depends on your kids though, some are scared of the noise, the fire, the villians etc. I would be sure to tell them all about it ahead of time, maybe bring ear plugs if they don't like the noise, and be prepared to get up and leave if they get upset. As far as MGM, there are a lot of fun things to do for all ages. It is mostly shows, but we all enjoy the Little Mermaid show, the Beauty and the Beast show, the Indiana Jones show, the Great Movie Ride, and the Backlot Tour. Yours may enjoy Playhouse Disney, mine did when they were younger. Look at wdwinfo and read about all of the other shows/rides there and decide what you think they will like. We always enjoy a full day at MGM!!!