As for dolphins' watching, I better show you some photos:
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Some weekends ago we drove to Ras Al Jins with my dear friend and her family. We had booked the turtle watching tour at Ras Al Jins Scientific and Visitor Center about a week in advance. We had decided to go for evening tour, starting at 9pm, had to pay 3OMR for an adult and 1OMR for a kid. We were first taken by the bus nearer to the beach, then the guide gave us some information about the turtles nesting while other guide was already further on the beach to look for turtles. After a short walk we arrived very close to the sea and first we could see a turtle that laid eggs: flop and flop, one after another. Then, we saw some turtles who already returned to the sea. Then, another one who was covering the nest with sand. And finally a tiny turtle baby. The guide said we were lucky that we could see so much.
It was not allowed to take any photos (to not scare away the turtles) and it was disgracing how some south-European tourists just could not understand it and the guide had to explain them over and over again that taking photos, even without lighting, is prohibited.