Invest a few leisure hours reading through the dozens of tour reports from Rick Steves participants. Not all of them are here on the forum. You can search the intertubes for the name of the tour +"trip report" and come up with literally hundreds of mostly enthusiastic, but brutally honest, reviews and day-by-day narratives, most hosted at blogs with photos. IN the many reports I have slogged through, I can only recall negative information in less than 10% of the total number of days covered and that was usually about weather or other unpreventable issues.
The philosophy of this organization includes deliberately not scheduling every waking moment. This allows participants a tremendous amount of free time to explore, read, nap, shop, or get into trouble.
You will find there are some folks who are not happy about anything but maybe they shouldn't go on these adventures.
I just returned from the Best of Scotland ten-day trip, traveling as a solo. I had a wonderful experience and so will you.