the rothiemurcus estate is worth a look , they do wildlife tours by landrover and have heated hides and stuff for
Badgers , pine martins etc - i think they can pick you up from the station at aviemore also
Rothiemurchus Estate in the Highlands of Scotland
alternatively aigas feild centre , near inverness would be an option , again they do tours and have hides etc - they also have a
Beaver pair living semi wild , and again i think staff will pick you up and drop you off at local stations - they also have a hire car for day trips if you can drive but dont have a vehicle
Aigas Field Centre - Sharing the Wonders of the Wild Highlands