You can see the fireworks from some of the restaurant balconies. Check Tortilla Joe's, Jazz Kitchen and Catal. You would need a table reservation. Time varies depending on park hours that day.
Depending on which park I highly doubt you could see the fireworks from Disneyland but you could probably see from California Adventure. You can see the ferris wheel from California adventure in some parts of the downtown areas but not great front center views.
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