Took us about 2 hours (50+ years old, average condition). Spectacular views, some height issues for me, and some narrow walk areas make it scary in a fun way. It is NOT just a walk around the walls - there are a lot of steps too. Get tixs in a small office just the right of the Pile Gate. I don't think a tour is needed and one might actually reduce the feel of the walk. Worth the $15 US. EARLY EVENING BEST. Avoid. The cruise ship crowds, and heat in summer.
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