I visited this spot on the Isla with my friend on my first visit to the island. To get there, we had to rent one of the golf carts that are available on the island. One could also rent a moped.
These ruins are in a state of disrepair, as you can see in the attached picture, and are really not much to see. However, there is a beautiful view across to Cancun from the spot.
There is a small path that leads to the ruins, but all that really seems important is to visit the spot. Nothing more can be seen by following the path.
I want to take my wife to visit this spot on our next trip, but that is because she has never seen this place. If you want to have the experience, you should visit these ruins. Otherwise, spend your time on Playa Norte.