if he is disabled he probably doesnt get out at much as he likes, but knows the area well, ask him where he would love to go. My suggestion would be go to the coast, Sheringham has a beach and restaurants, but is quite hilly if a wheelchair is involved. , any of the villages along the coast from Hunstanton to Wells, or even Sandringham (check if the house is open, they have a visitor centre and woodland walks. Dereham is the heart of Norfolk, you can get anywhere in the county within an hour.
You would be unlucky to find a village without a pub doing lunch. For the broads I would go North of Norwich and head for Coltishall/Wroxham area.