You can barbecue yourself. You can bring enough food for your own use (nobody cares if you barbecue on the roadside)
Spending the night on the island is usually within 100 per night. However, the price may go up on New Year's Day.
The local food is seafood. All kinds of seafood. You must try it when you go there.
Besides, it will be more troublesome if you don't drive. . You must take a bus to Qisha, and then transfer to a van.
I hope you have a good holiday!