Dress
The FCDO asks visitors to dress modestly in public, including in malls, with upper arms and knees covered. Keep swimwear for tourist beaches and hotel pools, and cover up before you walk into the lobby, a souq or a mall.
Ramadan
Ramadan moves about 11 days earlier each year, so check the dates before you book. During the fast, don't eat, drink, smoke or chew gum in public in daylight, including in your car. Expect shops and restaurants to change their hours.
Alcohol
Alcohol is legal for visitors in licensed venues such as hotels, restaurants and clubs, and the drinking age is 21. Drinking or being drunk in public is illegal, and British nationals have been arrested for it. Any trace of alcohol at the wheel can bring a fine and possible prison.
Behaviour in public
Public displays of affection are frowned upon. It's illegal for an unmarried couple of the opposite sex to share a hotel room, and to swear or make rude gestures, including at other drivers. Ask before you photograph people, and don't photograph government buildings or military sites.
The weekend
Oman's working week runs Sunday to Thursday (the Central Bank keeps those hours), so Friday and Saturday are the weekend. Government offices and banks close then, so plan paperwork and money changing for weekdays.
Food and drink
The tourism board is frank that Omani families traditionally entertain at home rather than in restaurants. That makes the handful of places cooking Omani food for visitors worth seeking out. Beit Al Luban in Muttrah is the one we'd book first. Look out for harees and majboos. For seafood, skip the smart hotel dining rooms and head to the fish market at Seeb. In Salalah, lobster and kingfish are the catch to ask for. Alcohol is served only in licensed hotels, restaurants and clubs, and you must be 21.