The outside is always open, it's the inside the fort which might be closed

Non lo so con certezza ma penso di no....

not to sure where the diplomatic area is, but very poor public transport. you can take bus number 5 from Manama, then walk half an hour to the site. The fort is also easy to reach via car; it’s a 10-minute drive from central Manama and is well-signposted once outside the city

I too am unable to say yes with any confidence! I can say I didn't see any staff while on my tour, and horses were risen around the area openly! I can't see why not as long as owners are respectful with dog waste... I have found that dogs are not a common pet in the Gulf...

Indeed no entrance fee

its free of charge and they are open until 4pm in the afternoon.. for the parking they also have and the great thing when u go to the mosque is you have a tour guide who will tour you around the mosque and its better to go early rather than to be late because they are closing 4 pm 😊

The Grand Mosque on your right, go straight on the highway till you reach the Junction near Diplomat Hotel, take left and continue on the highway, you will see the Sheraton Hotel and the Regency Hotel on you left and the Financial Harbor on your right, continue till you find Seef Mall on your left, take the right run on the Seef Junction, then take the left on the traffic light (near La Chocola Cafe), go straight on the next traffic light, and then left on the 2nd traffic light, you will see a museum on your right, where you can visit it first, set in the coffee shop and admire the Bahrain fort, and then have a walk to visit the fort. Have a nice day