Went up the the castle a couple of weeks ago, it's quite a steep walk up so bear that in mind. The castle is free entry, dogs are welcome but need to be kept on a lead. Beautiful views once inside the ruins and looking out over the estuary. Steps to go up and view parts of the castle and boards with information on the castle and its history. The three times that I have been up there its been just me and the dogs, very quiet and peaceful here. Definitely worth a visit if you like castles and beautiful views.