Waking this morning we found that we were no longer alone, with three other cruise ships joining us for this “tendered” day (no dock, so land is accessible via a fast 50 passenger boat which during it’s 15 minute journey was the only time I felt less than fine with the ocean!) …
What should be obvious is that the port now has about 10,000 visitors instead of the 2,000 or so on our ship; it made the day much more crowded and busy than we’d expected and rather spoiled things. But as we headed off for “cave tubing” we didn’t yet know that …
I’d imagined riding a tube down some underground river and seeing amazing rock formations, but the cave tubing experience was more of a “float in an underground lake” event; we first hooked up 16 people in their tubes, to travel as a single group through the pitch dark caves (hope you don’t mind some random persons feet tucked under your shoulders!)
There were some spectacular rock formations in the caves, and happily some of my waterproof camera photos came out ok:
M&I / GBMINI 
Odd that the signage doesn’t really show the journey correctly???
But as I look at it more it seems the view on the signage was of a cut away view.