Khasab is the only city in the Omani enclave of Musandam. It's the necessary crossing point to discover the "fjords" of Musandam.
My suggestion
Some small local travel agencies organize 2-day tours with a night in a tent on the beach. Although this concept sounds attractive on paper, people are surprised to discover that all the agencies offer to sleep on the same beach...
Jabal Akhdar is a mountainous region located approximately 2 hours' drive from Muscat. It's a magnificent place, between mountains and greenery, where the sun and the heat seem to have spared cultivation and vegetation.
Nizwa is one of the largest cities in the country. During your visit to Oman, don't miss out on this city packed with history and the centre of numerous activities.
Salalah is the most important town in the Dhofar region, located in the south of Oman. It's a town full of resources, such as its industrial port and its frankincense supplies. Travellers can discover culture and the frankincense harvest there, beautiful buildings and even scuba dive.