Hi Mariah,
Without knowing your sister, it's difficult to make a specific recommendation. Some guests might love a gourmet signature meal, while others would find this stressful. I encourage you to think about what would be most meaningful to your sister specifically.
Does she love sweets? Skip the meal and eat just the
Kitchen Sink instead.
Would some quite time be just what she needs? Order in a fancy room service meal.
Does she love steak? Try the Yachtsman Steakhouse.
Would dining with princesses make her feel like royalty? Then go to Cinderella's Royal Table.
Does she like old movies? Head over to the Sci-Fi Dine-In.
You get the idea.
Please write back and tell us about your sister's interests and food preferences and we'll recommend some restaurants tailored specifically for her.