They only last for half an hour, which is great if you're short on time and they're also good value for money. My only tips are to go on a sunny day and to bring a change of clothes – you're gonna get wet!
In small groups of about 16 you're led to pick up your water resistant ponchos – a bit stinky but they're a must. Once you're in your bright, fashionable, wet-weather gear you're led to have your photo taken, and then to the jet boat to get strapped in (you feel very secure). And then you're off for a thrill-seeking half an hour.
Your captain will whizz you through the harbour and its surrounds where you'll get to appreciate the full beauty of the city and its smaller islands, you'll also get to see some fabulous real estate from the water. See Sydney's famous sites including the Sydney Opera House, Fort Denison, Rose Bay, Goat Island, Taronga Zoo, the Sydney Harbour Bridge and much more. Along the way your captain will warn you before he decides to make any 270 degree turns so there are no nasty surprises. You'll experience Sydney Harbour at high speed with fish tails, wave riding, and massive sideways slides – just like a race car. You'll be drenched (no matter where abouts in the boat you sit – trust me!)
The boat speeds up to about 45 knots (about 80km/h), so you'll feel the wind in your hair, sea water all over you and adrenalin pumping through your body – the best way to spend half an hour in Sydney. Lots of fun!