You have all the activities linked to the sea in Sifah.
After a short drive in the mountains, you can reach Muttrah Souq (one of the oldest Souq in the world!).
A must see is the Sultan Qaboos Grand Mosque : It was built in Bausher in Muscat in 2001. From its minarets, large golden dome, arches, engraved walls, decorated interior, unique lamps and central crystal chandelier, the mosque is an absolute architectural wonder.
Ras Al Jinz : located in the city of Ras Al Hadd in eastern Oman. It is a natural reserve for endangered green turtles where around 20,000 females return to every year to lay their eggs. Beside the marvelous beach, crystal waters and golden sands of Ras Al Jinz, visitors can enjoy watching the turtles digging their nests and laying eggs, and even see the small turtles hatch their eggs and head back to the sea. This amazing nature observation is organized by tour guides from the Turtle Reserve very early in the morning.
Shatti Al Qurum : Shatti Al Qurum, or Al Qurum beach, is one of the longest beaches in Oman. It lies in the capital of Muscat on the northern coast. It is one of the busiest beaches, as there are numerous cafés, restaurants, shopping malls and hotels located nearby.
Wadi Bani Khalid : can be fairly called a natural green and colorful paradise on Earth. The wadi (valley) is located in the Al Sharqiyah Region and has several water pools as well as a spring (ayn in Arabic) that keeps water flowing inside the wadi all year long. Wadi Bani Khalid also has several villages inside and colorful plantations among its lands. With all of that and the uniquely red rock formations, the wadi looks resembles a mind-blowing painting.
Forts and castles : Oman has a unique heritage, and its ancient history and culture can be appreciated through the different forts and castles on its lands. A visit to Oman must accompany a walk through this heritage, which can be witnessed in Nakhal Fort, Nizwa Fort, Jibreen Castle, Al Hazm Fort, Al Rustaq Fort and many others in every corner of Oman.
Jebel Al Akhdar, the Green Mountain, is one of the marvelous mountains that is part of the Al Hajar range in the Al Dakhliya region. It is named after the green areas and plantations covering its rocky lands. The mountain has several hiking trails, and villages where people raise animals and farm.
The National Museum was established in 2016 in Muscat as a showcase for Omani heritage. Covering an area of 13,700 square meters (147,000 sq ft), the museum has several galleries that explains the history and culture of Oman, along with big electronic monitors that brings the exhibited crafts to life.The galleries inside the museum are divided as follows: Oman and the World, Intangible Heritage, The Land and the People, Maritime History, Prehistory and Ancient History, Splendours of Islam, Arms and Armour, Aflaj, Renaissance, Currency, and others.
Jebel Shams, or the Mountain of Sun, is another impressive mountain in the Al Hajar range in the Al Dakhliya region. It is the highest point of the mountain range, and it is believed to be the first point where the sun rises, which is what inspired its name. The mountain has great hiking trails, as well as spectacular views of the region from its top.
Majlis Al Jinn has the second largest cave chamber in the whole world. It is located around 1,380 meters (0.86 miles) above sea level, and can only be entered through few holes at the top of the cave. It is the perfect destination for climbing and hiking adventurers and a great place for taking pictures of the unique rocky formations and the cave’s interior.
The Royal Opera House was built in 2011 in the area of Shatti Al Qurum in Muscat. The distinguished Omani contemporary architecture makes it looks like a palace. The Royal Opera House is the main venue for arts in the capital city of Muscat and offers various international performances.
Sands of Rub’ Al Khali : If you love deserts and sand dunes, then you should settle for nothing but the largest continuous sand desert in the world. Al Rub’ Al Khali, or the Empty Quarter, is the desert in western Oman and covers parts of UAE, Yemen and Saudi Arabia as well. Reaching an area of 650,000 square kilometres (250,000 square miles), the desert has unique biodiversity and is considered to be the world’s most oil-rich area.
Bimmah or Dabab sinkhole is located in eastern Oman near Muscat. It was formed due to the dissolution of lower layers of limestones that caused the surface layer to collapse creating this big hole. It is famous for its crystal turquoise waters as well as the rocky formations that surrounds it. This amazingly beautiful sinkhole is a must-visit attraction in Oman.
Muscat : is not only the capital city of Oman, but it also combines both natural and architectural beauty in every corner of its lands. It has marvelous beaches like Al Qurum and Al Bustan, the Royal Opera House, and famous hotels and boutique hotels. Wherever you go in Muscat, you will find a unique activity to do or a mind-blowing natural place to enjoy.
More info : https://theculturetrip.com/middle-east/oman/articles/20-must-visit-attractions-in-oman/