There are numerous pubs on the course of varying iconic note and many will serve food during the day and evening. The Manx people are very friendly so these places will be great to stop in.

Having only visited during TT I don't know the opening/closing dates of the many attractions but the island is not big so changing plans is straightforward.

Joey's statue up at the bungalow is worth a photo stop. Various museums and attractions (Laxey Wheel, Transport Museum, Castle Rushen in Castletown, etc.) all around but check for opening times. Don't forget a lap of the Southern 100 circuit too!