My parents live in Nadur on Gozo and the beach that Corrie used is Ramla Bay, about a 5 min drive from Nadur. The bar they were sitting at is one of two beach bars at Ramla and that one is owned by a guy called Mario. The setting of the last scene where they watched the sun go down is at the Azure Window in Dwerja which is further north in the island.
We go to Gozo every year, my husband loves it and wants to move there. The people are very friendly and welcoming. Of course, they love the British anyway. Personally I think Gozo is a lot better than Malta but then I'm biased. I agree with the Blue Lagoon trip, snorkelling there is a must but watch the fish, they nibble your feet if you're not watching! LOL
We were there 2 weeks ago and the temp was 40 C.
Some places still resemble a building site because they are always building new houses.