There are swimming platforms close to the water with ladders for easy access back on to the jetty. If fishing / wetting a line is your thing the jetty is a relaxing way to spend a summers evening, lots of locals are often out there & happy to share there knowledge. A simple hand-line can bring a lot of fun & maybe dinner!
Check out the Underwater Observatory, walk or train
During the day you can walk the jetty or train out to the amazing underwater observatory descending 9 mts under the water with out getting wet. The sights are amazing thorough the large windows looking out to the soft corals growing on the pylons.
Scuba dive or walk underwater in a special helmet.
Maybe see fish swimming by of all shapes & sizes. Sometimes a playful seal may be cruising by to see what yummy treats are around. However if your really adventurous now you can walk the sea bed with a divers helmet on, you don't need to have scuba dived before so this is a very special experience for almost anyone. However bookings are essential.