We will have about 3 to 4 hours after immigration, etc to spend. How long does it take to get into the city? What's the best way to do that? Is there time for us to do something? Would it be better for us to go somewhere other than the city center during that time (we will have 2 1/2 days later in the trip to explore Edinburgh). I will be traveling with my 3 kids and I would like to find something nice to do with them in-between flights.