We opted for the VIP tour for an extra $15. There...

We opted for the VIP tour for an extra $15. There were 3 of us and it basically includes a short drive to visit the control room. In our case it provided an opportunity to talk with the operator on duty and ask more detailed questions. Even with that, I wish there was more detailed information but I think most would find it sufficient. The observatory is very close to one of the cave/river guide companies. Driving around the surrounding smaller roads was worth the effort as this is Puerto Rico's karst geologic province. The National Park cave was still closed.