We went on our own last summer and were able to tour the casino and aquarium. It was much later in the afternoon when we got there and the dig was closed. There were several employees standing "guard" to ask if we were hotel guests. When we stated we wanted to pay to tour the dig, they informed us it was closed. I don't know if we were supposed to but, we also walked around the outside of the property--just outside the casino and aquarium areas. There are outside ponds, etc., that are actually the top of the underground aquarium. It was beautiful. I would suggest going earlier in the day, however.