Appreciate recommendations on 3-5 day, small group bus tours of the Highlands leaving from/returning to Inverness.
Many of us on the forum have used and enjoyed Rabbies
https://www.rabbies.com/en-us/2026-travel
Here are the choices from Inverness
https://www.rabbies.com/en-gb/tours/scotland/from-inverness
I recently took a three day Rabbies tour out of Inverness. It went to Lewis and Harris so that tour may not be the one you want.
My tour was excellent. They do have others out of Inverness.
FYI, you've posted in the Croatia forum. You may get more responses in the Scotland forum.
As mentioned, Rabies is a good choice.