We will stop at Corfu in late April 2019 on a cruise. Has anyone taken a small group tour (4-10 people) of Corfu that they would recommend. We arrive at 9:00 hr and sail at 18:00 hr.
Your cruise ship should have some tour operators that they can recommend to you; sometimes these work at a discount for cruise ship passengers so check there first.
With the time frame you have, you might want to seek out a tour that allows for some sightseeing/driving, a leisurely lunch, visit a beach, then back at Corfu town to sightsee and shop, have a frappe, and back to your ship.
Try googling "Corfu shore excursions" and a lot of stuff will come up.