Hi Julie,
My family loves both
Tutto Italia and
Via Napoli. Tutto is more of an upscale authentic Italian restaurant, and definitely qualifies as a "nice" dinner. My children all enjoy eating there. Via Napoli features delicious pizza, which my 6, 8, 10 & 15 year-olds all love. The atmosphere there is light and more relaxed than Tutto Italia, so it really depends on what exactly you are looking for.
'Ohana is one of my family's "must-do" meals. The food is delicious, but the atmosphere is what is
really cool. The kids will enjoy coconut rolling races, limbo and hula dancing lessons while the adults get the chance to relax for a bit. I highly recommend this popular meal, which you'll want to make reservations for as soon as possible by calling 407-WDW-DINE.
Hope this helps and have a wonderful vacation,
Kaylene