I'm bringing 15 college students to Scotland for about 6 days. I believe we will spend 3 days in Edinburgh, and then I'd like to go to another base city/town to be able to do some beautiful day hikes--the kind of moderate hikes you can do with tennis shoes or good walking shoes. We will have backpacks and be using public transportation, hopefully staying in hostels. I could rent a bus or van if necessary. My experience with the big bus tours has not been good--too expensive and too much time spent in a bus rather than walking.
So basically I'm looking for a good base to go to from where we can get maybe 2 good day hikes. Any castle ruins would be a plus.
Thank you for any ideas.