Agree with above from DLPdaft
I have read trip reports where people have booked Walts around the time of the parade, but you are not guaranteed a window table. Walts is above the shops so you will be looking down on the parade IF you get a window table. Also like DLPdaft has said, the music is not piped in, so you will only hear the music through the window.
You could get a table at Caseys Corner or at Plaza but most likely these will be in high demand so you will have to stake these out. These are both counter service, so you cant do ADR, you just have to take a chance that you can get a free table. The only thing is that people will be standing on the pavement kerbside so for the parade your view may be blocked. The same for Dreams. People will be standing the other side of the railings so again your view of Dreams / The Castle may be blocked