We have one day to tour Edinburgh & already have tickets to the castle. It appears that it will be best to see that first & then I was thinking of going on the 1:00 pm Sanderman's tour. It is 2.5 hours. Wondering if we should take the morning tour & then do the castle? I know it will be a busy time in Edinburgh & I don't want to get caught up with wall to wall people at the castle. We will be seeing the Tattoo at 10:30 pm that night & will do Arthur's Seat the day before.