This trip was done on my way from Taiwan (to visit families) back to the US earlier this month. I chose these places partly because of pretty cheap flights connecting them, and partly because I felt at this time when our world is entering an uncertain future and genocide is committed in the heart of Europe once again, I would like to go see Bosnia myself, where war crimes were carried our right when I was born. This is really a trip to Bosnia, while the other 3 countries are layover/transit visits.
I only got 2 days in Oman (originally it was just an 8 hour layover but I managed to extend it by playing around with the tickets).
D1: Nizwa castle, fortress and souq. walking around Azaiba, Muscat at night
D2: National History Museum in the morning; Mutrah Souq and the fish market; Al Alam Palace, Mirani Fort and the National Museum. Fly out to Abu Dhabi in the evening