Hi,
If you want fireworks view from the Grand Californian, then you need to get a Downtown Disney View...not a park view (which is a view of DCA, and some of those views are questionable)
Downtown Disney views are the best, IMHO. We go alot, I am an annual passholder and it is great to be able to see the fireworks from your room and sometimes if you are lucky, even while lying in bed.
So, if seeing the fireworks is important, then change your view. If it is not, then the park view is nice too, but has some questionable views as well in that category (ie: park and parking lot view counts as park view)
Let me know if you have any other questions about the resort. I am happy to help.
Michelle