Grand Cayman is not the correct port. The correct port is Gran Canaria but it is not available from the drop down menu.
We took the Agaeta Valley Tour.
Participants should beware that although this tour is listed as moderate, there is a very steep goat path and several steep streets. This tour is moderate if you are in good health but I would consider it as strenuous for folks who are not accustomed to regular exercise. On our tour there were several participants who were not able to do the walking that was included. People with artificial knees, canes, foot surgery boots, overweight. The guide astutely arranged for cars to take them up/down the steep streets.
The RCL tour description also didn't do justice to the variety of scenery and information that this tour offered. The views of the natural rock formation called the Finger of God and the historic Red House were awesome. The garden of the Red House contained a wide variety of desert and tropic plants. Then the tour was capped with a visit to a family owned vineyard.
This was by far the best tour of the entire cruise for us.