From Scuba Do it is about a 50 minute drive to Cas Abou. Drive towards Westpunt and follow the signs to Playa Lagun. At one point you will start seeing the sign to Cas Abou. Just follow these.
You can park your car right at the parking near the beach. This is also where you can gear up and walking across the beach to enter the water. Swim towards the blue line and either dive to the right or left, depending on the currents.
The reef is hilly and slopes very gently whereby you get a very good and wide field of view. You have high chances to see some eagle rays, also right in the bay. There are many different kinds of corals under which are many sponges.