If you're looking to stay in the park, I definately suggest Mama Melrose's! It has a wonderful dinner atomosphere (slightly dark, strings of lights), and I've only eaten there once but both my dinner and sis's dinners were excellent. It's very much like Olive Garden.
If you go on a hot day, another good, cool-ing restaurant is SciFi. It's pretty dark and not only does that cool me off (and I'm used to Fl weather!), but it's also relaxing. It's definately not the same as Mama Melrose's (Sci-Fi is more "fun", Mama Melrose's is more "casual elegance).