From Scuba Do it is about 45 minutes drive to Porto Mari. Drive towards Westpunt and follow the signs to st.Willibordus. Just before the church go left (keep church on right hand side) and then follow the signs to Porto Mari.
You can park your car right at the parking. They will collect and entree fee on the beach. You can gear up next to the divecenter. You have some benches in the shadow where you can store your tanks and equipment. They also have a rinsing tank.
The reef of Porto Mari consists of a double reef with a sandy plateau in between, the valley. You have a good chance to see a eagle ray here. The reef has a very varied coral growth with hard and soft corals. You have a good chance in seeing a green sea turtle here aswell many other see critters like angelfish, parrot fish, yellow tail snapper.