Excellent adventure! As expected there is a long, steep hill trail climb but worth it.

The cave is big in "volume" and beautiful but there is not much to the tour as you can pretty much see from on end to the other. It is a self-guided audio tour with a guide that keeps you corralled in a group.
The Observatory on the other hand was spectacular! Made the whole trip worthwhile!

Excellent time! We were not sure what to expect as the details were a bit sketchy. Although you are on a catamaran sailboat, they use engine power to get to the island so don't worry about your stuff getting wet. Good lunch and snorkeling opportunity.

The distillery tour was good but the Old San Juan portion was extremely rushed. If you spend any time taking pictures you will never make it into a shop, so best to plan a return self-guided trip.