Wishes Preferred Viewing Question

[WSussex]

Hi All

We are going to WDW next August - never been in school hols before and I know it's going to be very busy!!! We are staying offsite - we have been so lucky on past trips to get great viewing spots so have been spoilt and Wishes is really our favourite thing to do so is it worth/can a non Disney guest book preferred viewing ??? Opinions please

Thanks in advance

Sx