We paid $4/pp each way plus $1 on the way out for the bridge toll. Took about 5 minutes to get there.
We went there in the evening to do a little gambling. After losing our money ($20- wow big spenders!) we wandered around the place. The dig was open and people were wandering in and out of it for free. Also, the grounds were open, so we walked around and looked at the nice lagoons and pools. This may not always be the case, but it was on this particular evening.