When are you going to the park? During the busy times of the year (e.g., Spring Break, weekends, etc.), PtN is still a very popular show and the curb-side/front-row spots fill up well before the parade steps off. If you're wanting a chance at a curb-side/front row spot, I'd aim to be on the route no less than 90 minutes before the parade starts (two weekends ago - the start of the peak Spring Break period - I saw folks sitting on the curb from just after Soundsational finished up). I'd allow about 90 minutes for dinner at Blue Bayou (it usually takes my family about 60 minutes for a two-course meal). So all in all, to be safe and allow for unexpected delays (e.g., long wait to be seated), I'd look for a reservation between 5:00 and 5:30 pm or there about.