I found myself wondering if there is a market for a slightly more adventurous itinerary? I recently enjoyed a trip out of Oban that included Mull, Iona, and Staffa Islands. The Rick Steves tours are limited to Mull and Iona. I realize the Staffa portion involves a higher level of activity to climb the steep steps and hike out to the puffin colony. Wouldn't some of Rick Steves' customers like to have a tour option that was willing to go one step up on the physical activities?
Carol this sounds like the kind of add-on that RS could provide through "shared tours" discussed in other places shared tours blog
If you are interested in more adventurous/active tours take a look at REI Adventures. They run active trips is many European countries as well as worldwide. These are in Scotland:
What Lola said.