Ahh, thanks for that. Yeah we have seen videos and such on Youtube which shows a lot more excursions than what we are currently being offered. My partner has already tried to reach out to RC to see what's up, though I don't think they understood the question so he has had to reattempt and the second time they said they would get back to him. I know it is closer to the end of season, but I doubt all they could find was one excursion partner.
We have already checked for other cruises that are visiting and only 1 other ship is in that day, I believe quite a lot smaller as well. So I doubt it'll be solely due to how busy it is. I honestly just think they have forgot to put the rest up tbh. But yeah, all we just have the Spirits of Santorini that has been sold out.
As you said, due to the tendering and ticket system, my partner would prefer an excursion just to get off the ship with more ease. I myself I'm not too bothered as I have been to Santorini before maybe about 5 years ago and have done quite a lot of the usual spots. Plus, at least it's a long 13 hour stay, so we do have time on our hands, if we do have to wait to tender and cable car it up!