Snorkeling
There are some beautiful reefs in the Cronulla with most in the South. If you follow the coast line of Cronulla you'll come across 2 parks the first one is called Shelly Beach and the next Oak Park. These are awesome places to go and see the reefs of Cronulla and if your even more adventurous you could go across to Bundeena, which has a vast area of reef which most of the time you'll have to yourself. :)
Surfing
Is available at all the Cronulla ocean beaches. Surfboard hire is available at Wanda Beach
Swimming
You can choose to swim in the surf, or the rock pools at the ocean beaches, or in the calm waters of the bay.
Walking
Along the esplanade. Head south from North or South Cronulla beaches, you can walk from an hour or so along this paved waterfront path.
Sunbathing
Just lying on the beach doing nothing
Pro Drive Cronulla
Offers dives and introductory courses around Cronulla
Movies and Books
If reading is your thing there is a modern and comfortable library on the mall, with lots of space for lounging around with a book. (http://www.suthlib.nsw.gov.au/). There are also a movie cinemas accessible from the northern end of Cronulla Mall located on the Kingsway next to McDonalds, showing all the latest flicks. You will always get a seat.