On my last full day in Scotland, back in October, we took the bus to Stonehaven, in Aberdeenshire. From there we walked along the coast to Dunnottar Castle. This ruined medieval fortress sits on a rock headland only accessible by walking down to the water and then back up a set of stone stairs. The ground a carefully tended, and most structures have signs explaining what they were, so you get the rugged feel of a ruined castle and the perks of a ticketed landmark (I think it was about 5 pounds to visit).
[35mm taken with my 1999 Olympus 105G Superzoom. Click here for more pictures of Scotland.]