Zurrieq and Ghar Lapsi are the most important diving spot of the south :
Wied Iz-Zurrieq as cirkewwa is a comfortable place where you find parking, restaurants, bathrooms and also a beautiful viewpoint from where you can easily see FILFLA islet.
From this diving spot you can take the boat to visit the Blue Grotto or in case you do not feel like going by boat then you also can see it from the top of the hill where are the cliffs. If you would like to stay there after your dives you can do so as there is a bus stop in case you need to come back using the public transport.
Ghar Lapsi is also on the south of the island, just 5 min away from Zurrieq. This town is perfect for families; has a nice small bay where you can swim, and also to do diving. If you would like to eat there you can find a couple of restaurants around specialized in seafood.
Nice and Quiet