What do you after get the diving suit on mysims agents?

Once the Sims have got their diving suits from the store they need to go to the fishing island with the blue car ferry going to and fro.

Go through the fishing island to your left into the jungle there is a beach at the end of the jungle.

Go into the water and swim until you reach the reef then press A at the reef.

Then you can go scuba diving and then collect treasure.