Disneyworld is wonderful no matter what rides you go on. It all depends on how adventurous your six-year-old is. The first trip we took one of my sisters was four and she went on everything. She loved Big Thunder Mountain Railroad and made us go on that three times in a row, it’s still a hit today. She also loved Pirates of the Caribbean and Splash Mountain. However, another trip we took my youngest sister who was 6 and she was afraid of everything. She didn’t like the fast rides or anything that was dark. With her she stuck to It’s A Small World, The Mad Tea Party (Tea Cups), and the Tomorrowland Indy Speedway.
It’s Tough to Be a Bug is a must see as well as Fantasmic. Have a wonderful trip.

My family travels to Disney at least once a year. Having relatives in high "Disney" places makes our trips very special, easy going due to their inside knowledge! I have 2 boys, but I'm sure I can answer any question's you may have!