We arrived about 30 minutes before they closed at ...

We arrived about 30 minutes before they closed at 3pm. It appears their policy is the last person is let in at 3pm. We parked (backed in as requested) and set our phones to airplane mode as also requested. We were told we could use our phones to take photos, so long as they were in airplane mode. Numerous signs around the campus suggest otherwise, but that didn't stop me. We had to walk up a very steep hill to get to the observatory area. We purchased our tickets, 2 seniors, 1 child, and 2 adults. The senior price and the child price were the same. I think it was $12, and then $15 each for the adults. The radio telescope is huge! Quite the site to see. They have a limited museum with things to check out and explanations of how the radio telescope works. All very fascinating. Then you exit out of a door that is not well marked. You think that you are going out the emergency exit or something. Once out there, there was a guide speaking to a group in Spanish. The radio telescope itself was moving, and was very cool to see. After the tour guide stopped speaking, the telescope stopped moving, so not sure if it was a demonstration or not. If you are in Puerto Rico, I highly suggest you check this out. All you need is about 30 minutes of your time. This of course does not take into account how long it will take you to get there.