Most (if not all) restaurants in Miyajima only open for lunch, since most visitors are day visitors. Make sure you have a suitable dinner option (or are willing to have no dinner at all) if skipping the dinner at the ryokan.

I suppose the time in Osaka is intended for visiting Expo 2025 and that you have already been to Kyoto and Nara. This is a good itinerary if so (except for the Golden Week part, but I guess you have no choice here).